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Latest information

Result of the 193rd nikoli.com Puzzle Championship Jul 26, 2014

Congratulations! mizuike won the 193rd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Aug 10, 2014 13:00 (UTC). Please note the start time. The time trial problem will be a Heyawake puzzle contributed by -4.

Author round-table Vol.20Jul 22, 2014

Today our theme is Ripple Effect. It's a comparatively new puzzle. There hasn't been a lot of talk about Ripple Effect. What kind of a story can we expect to hear here? The guests are Turing-Joe Jr. and T. Karino. From Nikoli we have Nob and NyanBaz.

Maintenance finished Jul 18, 2014

About 15 minutes after 05:00 Jul 18, 2014(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Results of the Nikoli Derby - 13th world championship Jul 17, 2014

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 13th world championship.

We hope you are one of the winners!

Added Botsu Bako problem Jul 14, 2014

aspirin's Yajilin problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jul 1, 2014

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Past information

193rd Puzzle Championship Jul 25, 2014

Puzzle Championship nikoli.com holds 193rd puzzle championships on our members page on Sat. Jul 26, 2014 01:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Jul 14, 2014

from Fri, Jul. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 192nd nikoli.com Puzzle Championship Jul 12, 2014

Congratulations! hrs won the 192nd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Jul 26, 2014 01:00 (UTC). Please note the start time. The time trial problem will be a Yajilin puzzle contributed by T.Karino.

192nd Puzzle Championship Jul 11, 2014

Puzzle Championship nikoli.com holds 192nd puzzle championships on our members page on Sat. Jul 12, 2014 01:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Entry to The Nikoli Derby was closed Jul 9, 2014

We will announce the ranking of all participants of the 13th Nikoli Derby on Thu. Jul 17th.

The Nikoli Derby - 13th world championship will soon be closed.Jun 30, 2014

The Nikoli Derby - 13th world championship Entry to The Nikoli Derby - 13th world championship will soon be closed. The winners will get an original nikoli goods. Make sure you enter. Deadline Wed. Jul 9, 3:00(UTC)

Result of the 191st nikoli.com Puzzle Championship Jun 27, 2014

Congratulations! kezukezu won the 191st puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Jul 12, 2014 01:00 (UTC). Please note the start time. The time trial problem will be a Slitherlink puzzle contributed by -4.

191st Puzzle Championship Jun 26, 2014

Puzzle Championship nikoli.com holds 191st puzzle championships on our members page on Fri. Jun 27, 2014 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Jun 20, 2014

About 15 minutes after 05:00 Jun 20, 2014(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Author round-table Vol.19Jun 18, 2014

The guests this time are Guten and Ogawa Minori. They often adjust their finished puzzles after they have sent them in. We asked them to tell about puzzle adjustments. From Nikoli we have NyanBaz and Nob.

Announcement of the maintenance work Jun 16, 2014

from Fri, Jun. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 190th nikoli.com Puzzle Championship Jun 13, 2014

Congratulations! pisaca won the 190th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jun 27, 2014 13:00 (UTC). The time trial problem will be a Shakashaka puzzle contributed by Momotereu.

The Nikoli Derby - 13th world championship Jun 12, 2014

The Nikoli Derby - 13th world championship Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt.

190th Puzzle Championship Jun 12, 2014

Puzzle Championship nikoli.com holds 190th puzzle championships on our members page on Fri. Jun 13, 2014 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Jun 3, 2014

Momotereu's Heyawake problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Shikaku, Sudoku and Shakashaka puzzles to The pick of the puzzles page Jun 2, 2014

Most popular Shikaku, Sudoku and Shakashaka puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 189th nikoli.com Puzzle Championship May 30, 2014

Congratulations! BlackTent won the 189th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jun 13, 2014 13:00 (UTC). The time trial problem will be a Hashiwokakero puzzle contributed by aiko.

189th Puzzle Championship May 29, 2014

Puzzle Championship nikoli.com holds 189th puzzle championships on our members page on Fri. May 30, 2014 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author round-table Vol.18May 27, 2014

The guests this time are YukiHiro and nyoroppyi. The theme is a little difficult. What is it that leads to self-expression in how puzzle authors make their puzzles? From Nikoli we have NyanBaz and Nob.

Result of the 188th nikoli.com Puzzle Championship May 16, 2014

Congratulations! OLAKE, gorish and sinh9 won the 188th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. May 30, 2014 13:00 (UTC). The time trial problem will be a Akari puzzle contributed by Guten.

Maintenance finished May 16, 2014

About 15 minutes after 05:00 May 16, 2014(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

188th Puzzle Championship May 15, 2014

Puzzle Championship nikoli.com holds 188th puzzle championships on our members page on Fri. May 16, 2014 13:00 (UTC). The first correct solution is the winner. Please note the start time. We will set 3 kinds of problems at the same time. All puzzles are Numberlink puzzles, contributed by nyoroppyi, Pencil Rocket and Ogawa Minori.

The Nikoli Derby - 13th world championship May 13, 2014

The Nikoli Derby - 13th world championship Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt.

Announcement of the maintenance work May 12, 2014

from Fri, May. 16th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 187th nikoli.com Puzzle Championship May 2, 2014

Congratulations! MOMO won the 187th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. May 16, 2014 13:00 (UTC). We will set 3 kind of the time trial problems at the same time. All puzzles are Numberlink puzzles, contributed by nyoroppyi, Pencil Rocket and Ogawa Minori.

Added Nurikabe, Numberlink and Satogaeri puzzles to The pick of the puzzles page May 1, 2014

Most popular Nurikabe, Numberlink and Satogaeri puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

187th Puzzle Championship May 1, 2014

Puzzle Championship nikoli.com holds 187th puzzle championships on our members page on Fri. May 2, 2014 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 186th nikoli.com Puzzle Championship Apr 20, 2014

Congratulations! furudo.erika won the 186th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. May 2, 2014 13:00 (UTC). The time trial problem will be a Nurikabe puzzle contributed by -4.

Maintenance finished Apr 18, 2014

About 10 minutes after 05:00 Apr 18, 2014(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Author round-table Vol.17Apr 18, 2014

The guests this time are Yuichi Saito and POTS. We don't have a theme just like in author round-table 015. What kind of talk did we have? Read on. From Nikoli we have NyanBaz and Nob.

186th Puzzle Championship Apr 18, 2014

Puzzle Championship nikoli.com holds 186th puzzle championships on our members page on Sat. Apr 19, 2014 23:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Apr 14, 2014

from Fri, Apr. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Apr 7, 2014

aspirin's Slitherlink problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 185th nikoli.com Puzzle Championship Apr 6, 2014

Congratulations! motty won the 185th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Apr 19, 2014 23:00 (UTC). Please note the start time. The time trial problem will be a Hitori puzzle contributed by T.Karino.

185th Puzzle Championship Apr 4, 2014

Puzzle Championship nikoli.com holds 185th puzzle championships on our members page on Sat. Apr 5, 2014 23:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Slitherlink and Yajilin puzzles to The pick of the puzzles page Apr 2, 2014

Most popular Slitherlink and Yajilin puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

2014's April Fools' pageApr 2, 2014

2014's April Fools' page can be seen here. Get puzzles by "Puzzle Gacha".

Result of the 184th nikoli.com Puzzle Championship Mar 22, 2014

Congratulations! hasetti won the 184th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Apr 5, 2014 23:00 (UTC). Please note the start time. The time trial problem will be a Masyu puzzle contributed by aiko.

184th Puzzle Championship Mar 20, 2014

Puzzle Championship nikoli.com holds 184th puzzle championships on our members page on Sat. Mar 22, 2014 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Mar 20, 2014

About 10 minutes after 05:00 Mar 20, 2014(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Author round-table Vol.16Mar 19, 2014

Today, we talk about the popular pencil puzzle Akari. Our guests this time are SAKAMOTO, Nobuyuki, and mimic. From Nikoli we have NyanBaz and Nob.

Announcement of the maintenance work Mar 17, 2014

from Thu, Mar. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 183rd nikoli.com Puzzle Championship Mar 8, 2014

Congratulations! moka36 won the 183rd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Mar 22, 2014 13:00 (UTC). The time trial problem will be a Shikaku puzzle contributed by Guten.

183rd Puzzle Championship Mar 7, 2014

Puzzle Championship nikoli.com holds 183rd puzzle championships on our members page on Sat. Mar 8, 2014 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Hitori, Kakuro and Ripple Effect puzzles to The pick of the puzzles page Mar 3, 2014

Most popular Hitori, Kakuro and Ripple Effect puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Author interviews Vol.39Feb 25, 2014

Our guest this time is Kenja. He is a university student now. He is a member of the university swimming club. He is a real athlete.

Result of the 182nd nikoli.com Puzzle Championship Feb 22, 2014

Congratulations! nyoroppyi won the 182nd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Mar 8, 2014 13:00 (UTC). The time trial problem will be a Ripple Effect puzzle contributed by T.Karino.

182nd Puzzle Championship Feb 21, 2014

Puzzle Championship nikoli.com holds 182nd puzzle championships on our members page on Sat. Feb 22, 2014 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Feb 21, 2014

About 15 minutes after 05:00 Feb 21, 2014(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Feb 17, 2014

from Fri, Feb. 21st 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Feb 10, 2014

cherry's Hitori problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 181st nikoli.com Puzzle Championship Feb 8, 2014

Congratulations! deu won the 181st puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Feb 22, 2014 13:00 (UTC). The time trial problem will be a Heyawake puzzle contributed by aiko.

181st Puzzle Championship Feb 7, 2014

Puzzle Championship nikoli.com holds 181st puzzle championships on our members page on Sat. Feb 8, 2014 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author round-table Vol.15Feb 5, 2014

Our guests this time are OLAKE and -4. They were born just one day apart. We don't really have a theme this time. Just talking about puzzles, this and that. Then let's see what kinds of things we get to learn. From Nikoli we have NyanBaz and Nob.

Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Feb 3, 2014

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 180th nikoli.com Puzzle Championship Jan 24, 2014

Congratulations! Ziti won the 180th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Feb 8, 2014 13:00 (UTC). Please note the start time. The time trial problem will be a Yajilin puzzle contributed by aiko.

180th Puzzle Championship Jan 23, 2014

Puzzle Championship nikoli.com holds 180th puzzle championships on our members page on Fri. Jan 24, 2014 10:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Jan 17, 2014

About 20 minutes after 05:00 Jan 17, 2014(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Jan 14, 2014

from Fri, Jan. 17th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 179th nikoli.com Puzzle Championship Jan 10, 2014

Congratulations! ByronosaurusRex won the 179th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 24, 2014 10:00 (UTC). Please note the start time. The time trial problem will be a Kakuro puzzle contributed by T.Karino.

179th Puzzle Championship Jan 9, 2014

Puzzle Championship nikoli.com holds 179th puzzle championships on our members page on Fri. Jan 10, 2014 10:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jan 6, 2014

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 178th nikoli.com Puzzle Championship Dec 28, 2013

Congratulations! volxa won the 178th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 10, 2014 10:00 (UTC). Please note the start time. The time trial problem will be a Satogaeri puzzle contributed by bay wolf Jr.

178th Puzzle Championship Dec 27, 2013

Puzzle Championship nikoli.com holds 178th puzzle championships, the last championship of this year, on our members page on Sat. Dec 28, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author round-table Vol.14Dec 26, 2013

The theme this time is Shikaku. Our guests are Guten and Ryohei Nakai. From Nikoli we have NyanBaz and Nob.

Added Botsu Bako problem Dec 24, 2013

akasyo's Ripple Effect problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Dec 20, 2013

About 20 minutes after 05:00 Dec 20, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Dec 17, 2013

from Fri, Dec. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 177th nikoli.com Puzzle Championship Dec 14, 2013

Congratulations! bf81 won the 177th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Dec 28, 2013 13:00 (UTC). Please note the start time. The time trial problem will be a Slitherlink puzzle contributed by YukiHiro.

177th Puzzle Championship Dec 13, 2013

Puzzle Championship nikoli.com holds 177th puzzle championships on our members page on Sat. Dec 14, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Shikaku, Sudoku and Shakashaka puzzles to The pick of the puzzles page Dec 3, 2013

Most popular Shikaku, Sudoku and Shakashaka puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 176th nikoli.com Puzzle Championship Dec 1, 2013

Congratulations! RichardRoe won the 176th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Dec 14, 2013 13:00 (UTC). Please note the start time. The time trial problem will be a Hashiwokakero puzzle contributed by Ogawa Minori.

176th Puzzle Championship Nov 29, 2013

Puzzle Championship nikoli.com holds 176th puzzle championships on our members page on Sun. Dec 1, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author round-table Vol.13Nov 27, 2013

Our guests this time are T.Karino and Miya. They make hard problems a lot. From Nikoli we have NyanBaz and Nob.

Maintenance finished Nov 15, 2013

About 30 minutes after 05:00 Nov 15, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

175th Puzzle Championship Nov 15, 2013

Puzzle Championship nikoli.com holds 175th puzzle championships on our members page on Sun. Nov 17, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Nov 12, 2013

SAKAMOTO, Nobuyuki's Akari problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Announcement of the maintenance work Nov 11, 2013

from Fri, Nov. 15th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 174th nikoli.com Puzzle Championship Nov 3, 2013

Congratulations! aji won the 174th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Nov 17, 2013 13:00 (UTC). The time trial problem will be a Akari puzzle contributed by nyoroppyi.

Added Nurikabe, Numberlink and Satogaeri puzzles to The pick of the puzzles page Nov 1, 2013

Most popular Nurikabe, Numberlink and Satogaeri puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

174th Puzzle Championship Nov 1, 2013

Puzzle Championship nikoli.com holds 174th puzzle championships on our members page on Sun. Nov 3, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the Nikoli Derby - 12th world championship Oct 30, 2013

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 12th world championship.

We hope you are one of the winners!

Author interviews Vol.38Oct 24, 2013

Our guest this time is bay wolf Jr. He made his debut recently in nikoli.com. But he has played an active part in our publications, widely, from way back.

Entry to The Nikoli Derby was closed Oct 22, 2013

We will announce the ranking of all participants of the 12th Nikoli Derby on Wed. Oct 30th.

Result of the 173rd nikoli.com Puzzle Championship Oct 20, 2013

Congratulations! Mme.Chorizo won the 173rd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Nov 3, 2013 13:00 (UTC). The time trial problem will be a Nurikabe puzzle contributed by Ogawa Minori.

Maintenance finished Oct 18, 2013

About 20 minutes after 05:00 Oct 18, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

173rd Puzzle Championship Oct 18, 2013

Puzzle Championship nikoli.com holds 173rd puzzle championships on our members page on Sun. Oct 20, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

The Nikoli Derby - 12th world championship will soon be closed.Oct 15, 2013

The Nikoli Derby - 12th world championship Entry to The Nikoli Derby - 12th world championship will soon be closed. The winners will get an original nikoli goods. Make sure you enter. Deadline Tue. Oct 22, 3:00(UTC)

Announcement of the maintenance work Oct 15, 2013

from Fri, Oct. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

The Nikoli Derby - 12th world championship Oct 7, 2013

The Nikoli Derby - 12th world championship Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Result of the 172nd nikoli.com Puzzle Championship Oct 6, 2013

Congratulations! aquanote won the 172nd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Oct 20, 2013 13:00 (UTC). Please note the start time. The time trial problem will be a Masyu puzzle contributed by Pencil Rocket.

172nd Puzzle Championship Oct 3, 2013

Puzzle Championship nikoli.com holds 172nd puzzle championships on our members page on Sun. Oct 6, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Slitherlink and Yajilin puzzles to The pick of the puzzles page Oct 1, 2013

Most popular Slitherlink and Yajilin puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Added Botsu Bako problem Sep 30, 2013

nyoroppyi's Nurikabe problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Author round-table Vol.12Sep 30, 2013

Today's guests are Komieda who makes problems that have surprising appearances, and POTS who demands art in puzzles. They have made a lot of problems that paid attention to appearance. Today we will talk about the appearance of puzzles. From Nikoli we have the regulars NyanBaz and Nob.

The Nikoli Derby - 12th world championship Sep 24, 2013

The Nikoli Derby - 12th world championship Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Maintenance finished Sep 20, 2013

About 20 minutes after 05:00 Sep 20, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Result of the 171st nikoli.com Puzzle Championship Sep 20, 2013

Congratulations! MOR won the 171st puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Oct 6, 2013 13:00 (UTC). Please note the start time. The time trial problem will be a Shikaku puzzle contributed by T.Karino.

171st Puzzle Championship Sep 19, 2013

Puzzle Championship nikoli.com holds 171st puzzle championships on our members page on Fri. Sep 20, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Sep 17, 2013

from Fri, Sep. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 170th nikoli.com Puzzle Championship Sep 6, 2013

Congratulations! Kazunegi won the 170th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 20, 2013 13:00 (UTC). Please note the start time. The time trial problem will be a Hitori puzzle contributed by cherry.

170th Puzzle Championship Sep 5, 2013

Puzzle Championship nikoli.com holds 170th puzzle championships on our members page on Fri. Sep 6, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Hitori, Kakuro and Ripple Effect puzzles to The pick of the puzzles page Sep 2, 2013

Most popular Hitori, Kakuro and Ripple Effect puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Author round-table Vol.11Aug 30, 2013

The guests this time are Hammy and Miya. They are both authors who make a lot of unprecedented and novel problems, they are full of wishing to challenge things. We talk about newness of puzzles today. From Nikoli we have NyanBaz and Nob.

The Nikoli Derby - 12th world championship Aug 30, 2013

The Nikoli Derby - 11th world championship Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Result of the 169th nikoli.com Puzzle Championship Aug 24, 2013

Congratulations! jiatjiat won the 169th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 6, 2013 13:00 (UTC). Please note the start time. The time trial problem will be a Heyawake puzzle contributed by Guten.

169th Puzzle Championship Aug 23, 2013

Puzzle Championship nikoli.com holds 169th puzzle championships on our members page on Sat. Aug 24, 2013 00:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Aug 20, 2013

mimic's Shikaku problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Aug 16, 2013

About 95 minutes after 05:00 Aug 16, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Result of the 168th nikoli.com Puzzle Championship Aug 10, 2013

Congratulations! gorish (Numberlink), jmendelson (Kakuro) and bskbri (Sudoku) won the 168th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Aug 24, 2013 00:00 (UTC). Please note the start time. The time trial problem will be a Yajilin puzzle contributed by Guten.

Announcement of the maintenance work Aug 9, 2013

from Fri, Aug. 16th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

168th Puzzle Championship Aug 9, 2013

Puzzle Championship nikoli.com holds 168th puzzle championships on our members page on Sat. Aug 10, 2013 00:00 (UTC). The first correct solution is the winner. Please note the start time. We will set 3 kinds of problems at the same time. Casty's Numberlink, -4's Kakuro and Guten's Sudoku are waiting for your challenge.

Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Aug 5, 2013

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Author round-table Vol.10Jul 31, 2013

Today, we will discuss about Sudoku. The guests this time are Casty and Hone RokuoHone Rokuo. They make a lot of Sudoku which appear on nikoli.com and the mobile site. From Nikoli we have NyanBaz and Nob.

Result of the 167th nikoli.com Puzzle Championship Jul 27, 2013

Congratulations! rythen won the 167th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Aug 10, 2013 00:00 (UTC). Please note the start time. We will set 3 kinds of problems at the same time. Casty's Numberlink, -4's Kakuro and Guten's Sudoku are waiting for your challenge.

167th Puzzle Championship Jul 26, 2013

Puzzle Championship nikoli.com holds 167th puzzle championships on our members page on Sat. Jul 27, 2013 00:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Jul 19, 2013

About 20 minutes after 05:00 Jul 19, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Result of the 166th nikoli.com Puzzle Championship Jul 13, 2013

Congratulations! catmask won the 166th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Jul 27, 2013 00:00 (UTC). Please note the start time. The time trial problem will be a Slitherlink puzzle contributed by YukiHiro.

Announcement of the maintenance work Jul 16, 2013

from Fri, Jul. 19th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

166th Puzzle Championship Jul 12, 2013

Puzzle Championship nikoli.com holds 166th puzzle championships on our members page on Sat. Jul 13, 2013 00:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author round-table Vol.9Jul 3, 2013

The guests this time are SAKAMOTO, Nobuyuki and Ryohei Nakai, both are great at making easy problems. From Nikoli we have NyanBaz and Nob. When you've read this article, it will become much more pleasant for you to solve easy problems, we are sure.

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jul 1, 2013

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 165th nikoli.com Puzzle Championship Jun 30, 2013

Congratulations! TuringJoe_Jr. won the 165th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Jul 13, 2013 00:00 (UTC). Please note the start time. The time trial problem will be a Hashiwokakero puzzle contributed by Ogawa Minori.

165th Puzzle Championship Jun 28, 2013

Puzzle Championship nikoli.com holds 165th puzzle championships on our members page on Sun. Jun 30, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Jun 21, 2013

About 25 minutes after 05:00 Jun 21, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Jun 17, 2013

from Fri, Jun. 21st 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 164th nikoli.com Puzzle Championship Jun 16, 2013

Congratulations! pisaca won the 164th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jun 30, 2013 13:00 (UTC). The time trial problem will be a Ripple Effect puzzle contributed by aiko.

164th Puzzle Championship Jun 14, 2013

Puzzle Championship nikoli.com holds 164th puzzle championships on our members page on Sun. Jun 16, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Satogaeri!! Jun 10, 2013

Sample problems of satogaeri  puzzle nikoli.com started to release Satogaeri puzzles in the members area from Jun 10th(JST).

Move the circles to their home countries. Enjoy the fun of solving a Satogaeri.

Author interviews Vol.37Jun 6, 2013

Our guest this time is Z_H. He is in his 30s, a bachelor. His job is IT-related. He makes Hitori mainly in nikoli.com. He invented Satogaeri in 2002.

Satogaeri sample problems added Jun 4, 2013

nikoli.com now has 10 sample problems of Satogaeri puzzles. The 2 added problems are "Hard." Give them a try.

nikoli.com will start to release Satogaeri puzzles in the members area from June 10th 2013.

Added Shikaku, Sudoku and Shakashaka puzzles to The pick of the puzzles page Jun 4, 2013

Most popular Shikaku, Sudoku and Shakashaka puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 163rd nikoli.com Puzzle Championship Jun 2, 2013

Congratulations! kezukezu won the 163rd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jun 16, 2013 13:00 (UTC). The time trial problem will be a Shakashaka puzzle contributed by Guten.

163rd Puzzle Championship May 31, 2013

Puzzle Championship nikoli.com holds 163rd puzzle championships on our members page on Sun. Jun 2, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author round-table Vol.8May 27, 2013

Nikoli started publishing puzzles in paper media, books and magazines. Then we also went into electronic media such as the Internet, mobile phones, and game consoles, and there we have won a favorable reception. Today, we will talk about differences and commonalities between paper and electronic media. We have akasyo and aspirin with us today. From Nikoli there are NyanBaz and Nob.

Satogaeri sample problems added May 24, 2013

nikoli.com now has 8 sample problems of Satogaeri puzzles. The difficulty of the 3 added problems are "Medium" and "Hard." Give them a try.

nikoli.com will start to release Satogaeri puzzles in the members area from June 10th 2013.

Added Botsu Bako problem May 20, 2013

mimic's Masyu problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 162nd nikoli.com Puzzle Championship May 19, 2013

Congratulations! nyoroppyi won the 162nd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jun 2, 2013 13:00 (UTC). The time trial problem will be a Akari puzzle contributed by the ax and sword.

Maintenance finished May 17, 2013

About 40 minutes after 05:00 May 17, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

162nd Puzzle Championship May 17, 2013

Puzzle Championship nikoli.com holds 162nd puzzle championships on our members page on Sun. May 19, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

15th puzzle of nikoli.com is SatogaeriMay 15, 2013

nikoli.com will start publishing Satogaeri puzzles in our members area from June.

"Satogaeri" stands for "returning to the home country." In the puzzle you move circles so they end up in their (unique) home countries. Try out the sample puzzles of Satogaeri to get to know this wonderful puzzle.

Results of the 4th Flush Game Mar 14, 2013

Flush is a simple and easy game. You just guess and write down the phrases that the most people will imagine.

Look here for the results of the 4th Flush Game.

PS Vita download now available Mar 13, 2013

13 Mar 2013, PS Vita software "Puzzle by nikoli Sudoku V" is now on sale at the north America PlayStation Store.

Nikoli Sudoku V includes 50 Sudoku. The price is $4.99-. Make sure to get nikoli Sudoku V for your PS Vita.

Announcement of the maintenance work May 13, 2013

from Fri, May. 17th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 161st nikoli.com Puzzle Championship May 5, 2013

Congratulations! rorobo won the 161st puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. May 19, 2013 13:00 (UTC). The time trial problem will be a Nurikabe puzzle contributed by Guten.

161st Puzzle Championship May 2, 2013

Puzzle Championship nikoli.com holds 161st puzzle championships on our members page on Sun. May 5, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Nurikabe and Numberlink puzzles to The pick of the puzzles page May 1, 2013

Most popular Nurikabe and Numberlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Author round-table Vol.7Apr 26, 2013

The guests this time are OLAKE and Yuichi Saito. Both came across Nikoli when they were in primary school. They have continued contributing puzzles, soon for 20 years. We will have them talk about Nikoli puzzles in the old days and the new times now. From Nikoli we have NyanBaz and Nob.

Maintenance finished Apr 19, 2013

About 40 minutes after 05:00 Apr 19, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Result of the 160th nikoli.com Puzzle Championship Apr 19, 2013

Congratulations! AnchorNavy won the 160th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. May 5, 2013 13:00 (UTC). Please note the start time. The time trial problem will be a Masyu puzzle contributed by aiko.

160th Puzzle Championship Apr 18, 2013

Puzzle Championship nikoli.com holds 160th puzzle championships on our members page on Fri. Apr 19, 2013 03:30 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Apr 15, 2013

from Fri, Apr. 19th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Problem lists improved Apr 11, 2013

We improved the problem lists for each puzzle. In new lists, the puzzles which are going away within 7 days have a red frame and a remaining time. Please check them.

Added Botsu Bako problem Apr 9, 2013

nyoroppyi's Akari problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 159th nikoli.com Puzzle Championship Apr 5, 2013

Congratulations! vanillaice won the 159th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Apr 19, 2013 03:30 (UTC). Please note the start time. The time trial problem will be a Heyawake puzzle contributed by bay wolf Jr.

159th Puzzle Championship Apr 4, 2013

Puzzle Championship nikoli.com holds 159th puzzle championships on our members page on Fri. Apr 5, 2013 03:30 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

2013's April Fools' pageApr 2, 2013

2013's April Fools' page can be seen here. Weight loss effect by solving puzzles has been proved.

Added Slitherlink and Yajilin puzzles to The pick of the puzzles page Apr 1, 2013

Most popular Slitherlink and Yajilin puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Author round-table Vol.6Mar 28, 2013

The theme this time is Nurikabe. The guests are MINE, Ogawa Minori, and Momotereu. They make a lot of wonderful puzzles. From Nikoli we have NyanBaz and Nob. Momotereu is also on the Nikoli staff, but today, he came here as an author.

Result of the 158th nikoli.com Puzzle Championship Mar 22, 2013

Congratulations! BKTN won the 158th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Apr 5, 2013 03:30 (UTC). Please note the start time. The time trial problem will be a Shikaku puzzle contributed by aiko.

158th Puzzle Championship Mar 21, 2013

Puzzle Championship nikoli.com holds 158th puzzle championships on our members page on Fri. Mar 22, 2013 03:30 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Mar 15, 2013

About 85 minutes after 05:00 Mar 15, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Mar 11, 2013

from Fri, Mar. 15th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 157th nikoli.com Puzzle Championship Mar 8, 2013

Congratulations! deu won the 157th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Mar 22, 2013 03:30 (UTC). Please note the start time. The time trial problem will be a Hitori puzzle contributed by cherry.

Author round-table Vol.5Mar 7, 2013

Our guests today are akasyo and -4. They make a lot of excellent Kakuro problems. From Nikoli we have NyanBaz and Nob. Today is certainly for people who love Kakuro and of course also for people who are wondering about what is so great in Kakuro, so both kinds of people will be able to enjoy this discussion.

157th Puzzle Championship Mar 7, 2013

Puzzle Championship nikoli.com holds 157th puzzle championships on our members page on Fri. Mar 8, 2013 03:30 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Hitori, Kakuro and Ripple Effect puzzles to The pick of the puzzles page Mar 4, 2013

Most popular Hitori, Kakuro and Ripple Effect puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Added Hitori, Kakuro and Ripple Effect puzzles to The pick of the puzzles page Mar 4, 2013

Most popular Hitori, Kakuro and Ripple Effect puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Entry to The Flush was closed Mar 4, 2013

We will announce the ranking of all participants of The Flush on Thu. Mar 14th.

4th round of "Flush" - the word game will soon be closed.Feb 25, 2013

4th round of Flush - the word game4th round of "Flush" will soon be closed. The winners will get an original nikoli goods. Make sure you enter. Deadline Mon. Mar 4, 3:00(UTC)

Result of the 156th nikoli.com Puzzle Championship Feb 22, 2013

Congratulations! mizuike won the 156th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Mar 8, 2013 03:30 (UTC). Please note the start time. The time trial problem will be a Kakuro puzzle contributed by akasyo.

156th Puzzle Championship Feb 21, 2013

Puzzle Championship nikoli.com holds 156th puzzle championships on our members page on Fri. Feb 22, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Feb 15, 2013

Guten's Yajilin problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Feb 15, 2013

About 75 minutes after 05:00 Feb 15, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Feb 12, 2013

from Fri, Feb. 15th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 155th nikoli.com Puzzle Championship Feb 8, 2013

Congratulations! motty won the 155th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Feb 22, 2013 13:00 (UTC). The time trial problem will be a Yajilin puzzle contributed by T.Karino.

155th Puzzle Championship Feb 7, 2013

Puzzle Championship nikoli.com holds 155th puzzle championships on our members page on Fri. Feb 8, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author round-table Vol.4Feb 6, 2013

The guests of the 4th round-table are aspirin, mimic, and Momotereu. They are authors who make many radical problems, they are full of originality, and have a strong impact on persons solving their problems. Momotereu is on the Nikoli staff, but participates as an author today.

Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Feb 1, 2013

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

4th round of "Flush" - the word game Feb 1, 2013

4th round of Flush - the word gameThis is a simple and easy game. You just guess and write down the phrases that the most people will imagine. Please remember that what pops into your head maybe occurs to no body else. The winner will receive an original Nikoli T-shirt.

Result of the 154th nikoli.com Puzzle Championship Jan 25, 2013

Congratulations! sinh9 won the 154th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Feb 8, 2013 13:00 (UTC). The time trial problem will be a Slitherlink puzzle contributed by aiko.

154th Puzzle Championship Jan 24, 2013

Puzzle Championship nikoli.com holds 154th puzzle championships on our members page on Fri. Jan 25, 2013 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

4th round of "Flush" - the word game Jan 21, 2013

4th round of Flush - the word gameThis is a simple and easy game. You just guess and write down the phrases that the most people will imagine. Please remember that what pops into your head maybe occurs to no body else. The winner will receive an original Nikoli T-shirt.

Added silhouettes and colors to let you change your member page appearance Jan 18, 2013

We have added silhouettes to show difficulty level and colors to let you change the member's page appearance. Try out them on the appearance setting page on your member page.

Maintenance finished Jan 18, 2013

About 10 minutes after 05:00 Jan 18, 2013(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Author round-table Vol.3Jan 15, 2013

The guests of the third round-table are Casty and Guten. They're making problems with nikoli.com, and are special as very prolific authors.

Announcement of the maintenance work Jan 15, 2013

from Fri, Jan. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 153rd nikoli.com Puzzle Championship Jan 11, 2013

Congratulations! MOMO won the 153rd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 25, 2013 13:00 (UTC). The time trial problem will be a Numberlink puzzle contributed by Ogawa Minori.

153rd Puzzle Championship Jan 10, 2013

Puzzle Championship nikoli.com holds 153rd puzzle championships on our members page on Fri. Jan 11, 2013 13:00 (UTC). Please note the start time. The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added problem Jan 8, 2013

nyoroppyi's Heyawake problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jan 7, 2012

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 152nd nikoli.com Puzzle Championship Dec 29, 2012

Congratulations! MOMO (Akari), jiatjiat (Masyu) and norikin (Ripple Effect) won the 152nd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 11, 2013 13:00 (UTC). Please note the start time. The time trial problem will be a Hashiwokakero puzzle contributed by aiko.

152nd Puzzle Championship Dec 27, 2012

Puzzle Championship nikoli.com holds 152nd puzzle championships on our members page on Sat. Dec 29, 2012 01:00 (UTC). Please note the start time. The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author round-table Vol.2Dec 21, 2012

The guests of the third round-table are Ryohei Nakai and nyoroppyi. They are among the few students who are also nikoli.com authors.

Maintenance finished Dec 21, 2012

About 20 minutes after 05:00 Dec 21, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Dec 17, 2012

from Fri, Dec. 21st 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 151st nikoli.com Puzzle Championship Dec 15, 2012

Congratulations! wrhtnarz won the 151st puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Dec 29, 2012 01:00 (UTC). Please note the start time. We will set 3 kinds of problems at the same time. Guten's Akari, YukiHiro's Masyu and aiko's Ripple Effect are waiting for your challenge.

151st Puzzle Championship Dec 14, 2012

Puzzle Championship nikoli.com holds 151st puzzle championships on our members page on Sat. Dec 15, 2012 01:00 (UTC). Please note the start time. The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Shikaku, Sudoku and Shakashaka puzzles to The pick of the puzzles page Dec 3, 2012

Most popular Shikaku, Sudoku and Shakashaka puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 150th nikoli.com Puzzle Championship Dec 1, 2012

Congratulations! kurocchi won the 150th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Dec 15, 2012 01:00 (UTC). Please note the start time. The time trial problem will be a Shakashaka puzzle contributed by aiko.

150th Puzzle Championship Nov 30, 2012

Puzzle Championship nikoli.com holds 150th puzzle championships on our members page on Sat. Dec 1, 2012 01:00 (UTC). Please note the start time. The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author round-table Vol.1Nov 28, 2012

This is the 1st author round-table. Our guests are Komieda and SAKAMOTO, Nobuyuki.

Added Botsu Bako problem Nov 22, 2012

cherry's Hitori problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 149th nikoli.com Puzzle Championship Nov 18, 2012

Congratulations! doctor-masa won the 149th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Dec 1, 2012 01:00 (UTC). Please note the start time. The time trial problem will be a Heyawake puzzle contributed by the ax and sword.

Maintenance finished Nov 16, 2012

About 30 minutes after 05:00 Nov 16, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

149th Puzzle Championship Nov 16, 2012

Puzzle Championship nikoli.com holds 149th puzzle championships on our members page on Sun. Nov 18, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Nov 12, 2012

from Fri, Nov. 16th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 148th nikoli.com Puzzle Championship Nov 4, 2012

Congratulations! sinh9 won the 148th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Nov 18, 2012 13:00 (UTC) and the time trial problem will be a Shikaku puzzle contributed by T.Karino.

148th Puzzle Championship Nov 2, 2012

Puzzle Championship nikoli.com holds 148th puzzle championships on our members page on Sun. Nov 4, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Nurikabe and Numberlink puzzles to The pick of the puzzles page Nov 1, 2012

Most popular Nurikabe and Numberlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Author interviews Vol.36Oct 22, 2012

Our guest this time is the ax and sword. He is 29 years old and his work is with machines. He became an author for nikoli.com recently.

Result of the 147th nikoli.com Puzzle Championship Oct 20, 2012

Congratulations! Ziti won the 147th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Nov 4, 2012 13:00 (UTC) and the time trial problem will be a Hitori puzzle contributed by nyoroppyi.

Maintenance finished Oct 18, 2012

About 15 minutes after 05:00 Oct 18, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

147th Puzzle Championship Oct 18, 2012

Puzzle Championship nikoli.com holds 147th puzzle championships on our members page on Sat. Oct 20, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Oct 16, 2012

nyoroppyi's Hashiwokakero problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Announcement of the maintenance work Oct 10, 2012

from Thu, Oct. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 146th nikoli.com Puzzle Championship Oct 6, 2012

Congratulations! MellowMelon won the 146th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Oct 20, 2012 13:00 (UTC) and the time trial problem will be a Kakuro puzzle contributed by T.Karino.

We have made some improvements to Yajilin functioning (Flash) Oct 5, 2012

The Yajilin Flash Try-mode user interface has been improved. Thank you and please try it out!

146th Puzzle Championship Oct 5, 2012

Puzzle Championship nikoli.com holds 146th puzzle championships on our members page on Sat. Oct 6, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Slitherlink and Yajilin puzzles to The pick of the puzzles page Oct 1, 2012

Most popular Slitherlink and Yajilin puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 145th nikoli.com Puzzle Championship Sep 21, 2012

Congratulations! RichardRoe won the 145th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Oct 6, 2012 13:00 (UTC) and the time trial problem will be a Nurikabe puzzle contributed by cubic function.

Maintenance finished Sep 21, 2012

About 15 minutes after 05:00 Sep 21, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

145th Puzzle Championship Sep 20, 2012

Puzzle Championship nikoli.com holds 145th puzzle championships on our members page on Fri. Sep 21, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.35Sep 18, 2012

Our guest this time is HIRO FUKUSHIMA. He is in his 30s. And he is a programmer who looks becoming in his suit.

Announcement of the maintenance work Sep 18, 2012

from Fri, Sep. 21st 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Sep 11, 2012

Guten's Slitherlink problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 144th nikoli.com Puzzle Championship Sep 7, 2012

Congratulations! penroke won the 144th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 21, 2012 13:00 (UTC) and the time trial problem will be a Yajilin puzzle contributed by aspirin.

144th Puzzle Championship Sep 6, 2012

Puzzle Championship nikoli.com holds 144th puzzle championships on our members page on Fri. Sep 7, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Hitori, Kakuro and Ripple Effect puzzles to The pick of the puzzles page Sep 3, 2012

Most popular Hitori, Kakuro and Ripple Effect puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 143rd nikoli.com Puzzle Championship Aug 24, 2012

Congratulations! hiro-ym won the 143rd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 7, 2012 13:00 (UTC) and the time trial problem will be a Slitherlink puzzle contributed by Guten.

143rd Puzzle Championship Aug 23, 2012

Puzzle Championship nikoli.com holds 143rd puzzle championships on our members page on Fri. Aug 24, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Waiving the first monthly payment by PayPal was discontinued Aug 17, 2012

No payment has been necessary for the first month from Jun 27 to Aug 16, but from now, people who pay the monthly fees by PayPal are required to pay also for the first month. This is for technical reasons, and we are really sorry about that.

There is no change for existing (new) members who had the first monthly payment waived already. Please don't worry!

If you choose to pay the membership fees by credit card, you will be exempt for the first monthly payment like so far. This could be your chance to get to really enjoy nikoli.com.

Maintenance finished Aug 17, 2012

About 15 minutes after 05:00 Aug 17, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Result of the 142nd nikoli.com Puzzle Championship Aug 10, 2012

Congratulations! aji won the 142nd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Aug 24, 2012 13:00 (UTC) and the time trial problem will be a Akari puzzle contributed by nyoroppyi.

Announcement of the maintenance work Aug 9, 2012

from Fri, Aug. 17th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

142nd Puzzle Championship Aug 9, 2012

Puzzle Championship nikoli.com holds 142nd puzzle championships on our members page on Fri. Aug 10, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.34Aug 6, 2012

Our guest this time is Pencil Rocket. He is a 22 year old student studying robots.

Added Botsu Bako problem Aug 2, 2012

YukiHiro's Nurikabe problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Aug 2, 2012

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 141st nikoli.com Puzzle Championship Jul 29, 2012

Congratulations! detuned won the 141st puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Aug 10, 2012 13:00 (UTC) and the time trial problem will be a Hashiwokakero puzzle contributed by Guten.

141st Puzzle Championship Jul 27, 2012

Puzzle Championship nikoli.com holds 141st puzzle championships on our members page on Sun. Jul 29, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Jul 20, 2012

About 15 minutes after 05:00 Jul 20, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Results of the Nikoli Derby - 11th world championship Jul 18, 2012

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 11th world championship.

We hope you are one of the winners!

Announcement of the maintenance work Jul 17, 2012

from Fri, Jul. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 140th nikoli.com Puzzle Championship Jul 15, 2012

Congratulations! TuringJoe_Jr. (Numberlink), willwc (Sudoku) and NTKS (Ripple Effect) won the 140th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jul 29, 2012 13:00 (UTC) and the time trial problem will be a Masyu puzzle contributed by aiko.

Entry to The Nikoli Derby was closed Jul 10, 2012

We will announce the ranking of all participants of the 11th Nikoli Derby on Wed. Jul 18th.

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jul 2, 2012

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

The Nikoli Derby - 11th world championship will soon be closed.Jul 2, 2011

The Nikoli Derby - 11th world championship Entry to The Nikoli Derby - 11th world championship will soon be closed. The winners will get an original nikoli goods. Make sure you enter. Deadline Tue. Jul 10, 3:00(UTC)

Result of the 139th nikoli.com Puzzle Championship Jul 1, 2012

Congratulations! Spelvin won the 139th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jul 15, 2012 13:00 (UTC). We will set 3 kinds of problems at the same time. Guten's Numberlink, aspirin's Sudoku and Turing-Joe Jr.'s Ripple Effect are waiting for your challenge.

Author interviews Vol.33Jun 29, 2012

Our guest this time is Asaokitan. He is a veteran author who has contributed to Nikoli for a long time.

139th Puzzle Championship Jun 29, 2012

Puzzle Championship nikoli.com holds 139th puzzle championships on our members page on Sun. Jul 1, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

The first monthly payment to nikoli.com is waived Jun 27, 2012

Good news if you are still just thinking about joining us.

No payment is necessary for the the first month. A perfect chance to enjoy and get to know nikoli.com.

Major maintenance finished Jun 27, 2012

From 05:00 Jun 26 to 05:30 Jun 27, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com.

We apologize for the inconvenience and thank you for your understanding.

Announcement of major maintenance work Jun 26, 2012

Thank you for your playing at nikoli.com for more than five years. We will replace the nikoli.com server to make the playing here even more enjoyable, from Tue, Jun. 26th 16:00(UTC) to Wed, Jun. 27th 16:00(UTC) (at the latest). You will not able to access nikoli.com during this time. We apologize for the inconvenience and thank you for your understanding.

Added Botsu Bako problem Jun 22, 2012

SAKAMOTO, Nobuyuki's Akari problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Sorry for the access failure (everybody's pages)Jun 21, 2012

We are sorry. Because of the server trouble, you could not able to get access to the nikoli.com everybody's pages from Jun. 20 08:50 to Jun. 21 07:35(UTC).

Announcement of major maintenance work Jun 19, 2012

Thank you for your playing at nikoli.com for more than five years. We will replace the nikoli.com server to make the playing here even more enjoyable, from Tue, Jun. 26th 16:00(UTC) to Wed, Jun. 27th 16:00(UTC) (at the latest). You will not able to access nikoli.com during this time. We apologize for the inconvenience and thank you for your understanding.

Result of the 138th nikoli.com Puzzle Championship Jun 17, 2012

Congratulations! bf81 won the 138th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jul 1, 2012 13:00 (UTC) and the time trial problem will be a Shikaku puzzle contributed by Ogawa Minori.

138th Puzzle Championship Jun 15, 2012

Puzzle Championship nikoli.com holds 138th puzzle championships on our members page on Sun. Jun 17, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Shakashaka!! Jun 10, 2012

Sample problems of Shakashaka  puzzle nikoli.com started to release Shakashaka puzzles in the members area from Jun 10th(JST).

In Shakashaka you place black triangles in the white squares of the grid. Enjoy the fun of solving a Shakashaka.

The Nikoli Derby - 11th world championship Jun 10, 2012

The Nikoli Derby - 11th world championship Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Shakashaka sample problems added Jun 4, 2012

Sample problems of Shakashaka  puzzle

nikoli.com now has 10 sample problems of Shakashaka puzzles. The 2 added problems are "Hard". Give them a try.

nikoli.com will start to release Shakashaka puzzles in the members area from June 10th 2012.

Result of the 137th nikoli.com Puzzle Championship Jun 3, 2012

Congratulations! motris won the 137th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jun 17, 2012 13:00 (UTC) and the time trial problem will be a Heyawake puzzle contributed by cubic function.

Added Shikaku and Sudoku puzzles to The pick of the puzzles page Jun 1, 2012

Most popular Shikaku and Sudoku puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

137th Puzzle Championship Jun 1, 2012

Puzzle Championship nikoli.com holds 137th puzzle championships on our members page on Sun. Jun 3, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Shakashaka sample problems added May 25, 2012

Sample problems of Shakashaka  puzzle

nikoli.com now has 8 sample problems of Shakashaka puzzles. The difficulty of the 3 added problems are "Medium" and "Hard". Give them a try.

nikoli.com will start to release Shakashaka puzzles in the members area from June 10th 2012.

The Nikoli Derby - 11th world championship May 22, 2012

The Nikoli Derby - 11th world championship Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Result of the 136th nikoli.com Puzzle Championship May 20, 2012

Congratulations! mizuike won the 136th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jun 3, 2012 13:00 (UTC) and the time trial problem will be a Nurikabe puzzle contributed by Ogawa Minori.

Maintenance finished May 18, 2012

About 35 minutes after 05:00 May 18, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

136th Puzzle Championship May 18, 2012

Puzzle Championship nikoli.com holds 136th puzzle championships on our members page on Sun. May 20, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem May 17, 2012

T.Karino's Masyu problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

14th puzzle of nikoli.com is ShakashakaMay 15, 2012

Sample problems of Shakashaka  puzzlenikoli.com will start publishing Shakashaka puzzles in our members area from June. Try out the sample puzzles of Shakashaka to get to know this wonderful puzzle.

In Shakashaka you place black triangles in the white squares of the grid. The remaining white parts of the grid must form rectangles or squares.

Announcement of the maintenance work May 14, 2012

from Fri, May. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 135th nikoli.com Puzzle Championship May 6, 2012

Congratulations! moka36 won the 135th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. May 20, 2012 13:00 (UTC) and the time trial problem will be a Yajilin puzzle contributed by Pencil Rocket.

Added Nurikabe and Numberlink puzzles to The pick of the puzzles page May 2, 2012

Most popular Nurikabe and Numberlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

135th Puzzle Championship May 2, 2012

Puzzle Championship nikoli.com holds 135th puzzle championships on our members page on Sun. May 6, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.32May 1, 2012

Our guest this time is Turing-Joe Jr.. He is in the bachelorship of the late twenties. His occupation is an editor of a publishing company.

Akari Week!Apr 25, 2012

We are going to release an Akari puzzle every day from Apr 30 to May 6. All the Akari puzzles except that on Apr 30 will be large. A perfect chance to enjoy the logial complex world of Akari!

Result of the 134th nikoli.com Puzzle Championship Apr 22, 2012

Congratulations! volxa won the 134th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. May 6, 2012 13:00 (UTC) and the time trial problem will be a Hitori puzzle contributed by Hammy.

134th Puzzle Championship Apr 20, 2012

Puzzle Championship nikoli.com holds 134th puzzle championships on our members page on Sun. Apr 22, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Apr 20, 2012

About 20 minutes after 05:00 Apr 20, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Apr 16, 2012

from Fri, Apr. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 133rd nikoli.com Puzzle Championship Apr 8, 2012

Congratulations! deu won the 133rd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Apr 22, 2012 13:00 (UTC) and the time trial problem will be a Slitherlink puzzle contributed by Pencil Rocket.

133rd Puzzle Championship Apr 6, 2012

Puzzle Championship nikoli.com holds 133rd puzzle championships on our members page on Sun. Apr 8, 2012 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Apr 5, 2012

Asaokitan's Yajilin problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

2012's April Fools' page Apr 2, 2012

2012's April Fools' page can be seen here. Here we release two puzzles unearthed among the ruins that are in a particularly good state.

Added Slitherlink and Yajilin puzzles to The pick of the puzzles page Apr 2, 2012

Most popular Slitherlink and Yajilin puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 132nd nikoli.com Puzzle Championship Mar 23, 2012

Congratulations! nyoroppyi won the 132nd puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Apr 8, 2012 13:00 (UTC) and the time trial problem will be a Kakuro puzzle contributed by -4.

132nd Puzzle Championship Mar 22, 2012

Puzzle Championship nikoli.com holds 132nd puzzle championships on our members page on Fri. Mar 23, 2012 12:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Mar 16, 2012

About 15 minutes after 05:00 Mar 16, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Author interviews Vol.31Mar 13, 2012

Our guest this time is cherry. His age is a secret. He is a man of riddles. But he is a company employee.

Announcement of the maintenance work Mar 12, 2012

from Fri, Mar. 16th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 131st nikoli.com Puzzle Championship Mar 9, 2012

Congratulations! wakky won the 131st puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Mar 23, 2012 12:00 (UTC) and the time trial problem will be a Akari puzzle contributed by Casty.

131st Puzzle Championship Mar 8, 2012

Puzzle Championship nikoli.com holds 131st puzzle championships on our members page on Fri. Mar 9, 2012 12:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Hitori, Kakuro and Ripple Effect puzzles to The pick of the puzzles page Mar 2, 2012

Most popular Hitori, Kakuro and Ripple Effect puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 130th nikoli.com Puzzle Championship Feb 24, 2012

Congratulations! Caltan won the 130th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Mar 9, 2012 12:00 (UTC) and the time trial problem will be a Hashiwokakero puzzle contributed by cherry.

130th Puzzle Championship Feb 23, 2012

Puzzle Championship nikoli.com holds 130th puzzle championships on our members page on Fri. Feb 24, 2012 12:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Feb 20, 2012

mimic's Hitori problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Feb 17, 2012

About 15 minutes after 05:00 Feb 17, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Feb 14, 2011

from Fri, Feb. 17th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 129th nikoli.com Puzzle Championship Feb 10, 2012

Congratulations! vanillaice won the 129th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Feb 24, 2012 12:00 (UTC) and the time trial problem will be a Masyu puzzle contributed by Pencil Rocket.

129th Puzzle Championship Feb 9, 2012

Puzzle Championship nikoli.com holds 129th puzzle championships on our members page on Fri. Feb 10, 2012 12:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Feb 2, 2012

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 128th nikoli.com Puzzle Championship Jan 27, 2012

Congratulations! pisaca won the 128th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Feb 10, 2012 12:00 (UTC) and the time trial problem will be a Shikaku puzzle contributed by cubic function.

128th Puzzle Championship Jan 26, 2012

Puzzle Championship nikoli.com holds 128th puzzle championships on our members page on Fri. Jan 27, 2012 12:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.30Jan 24, 2012

YukiHiro is 22 years old. He studies electric systems as a graduate student and he is an amateur magician.

Maintenance finished Jan 20, 2012

About 20 minutes after 05:00 Jan 20, 2012(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Jan 16, 2011

from Fri, Jan. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 127th nikoli.com Puzzle Championship Jan 13, 2012

Congratulations! Kota won the 127th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 27, 2012 12:00 (UTC) and the time trial problem will be a Heyawake puzzle contributed by aiko.

127th Puzzle Championship Jan 12, 2012

Puzzle Championship nikoli.com holds 127th puzzle championships on our members page on Fri. Jan 13, 2012 12:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Jan 11, 2012

Komieda's Heyawake problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 126th nikoli.com Puzzle Championship Jan 6, 2012

Congratulations! rorobo won the 126th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 13, 2012 12:00 (UTC) and the time trial problem will be a Sudoku puzzle contributed by aspirin.

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jan 6, 2012

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

126th Puzzle Championship Jan 5, 2012

Puzzle Championship nikoli.com holds 126th puzzle championships on our members page on Fri. Jan 6, 2012 12:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 125th nikoli.com Puzzle Championship Dec 16, 2011

Congratulations! Kenja and tarotaro won the 125th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 6, 2012 12:00 (UTC) and the time trial problem will be a Nurikabe puzzle contributed by Pencil Rocket.

Maintenance finished Dec 16, 2011

About 45 minutes after 05:00 Dec 16, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

125th Puzzle Championship Dec 15, 2011

Puzzle Championship nikoli.com holds 125th puzzle championships on our members page on Fri. Dec 16, 2011 12:00 (UTC). The last championship of this year, We will set 2 kind of the time trial problem at the same time. Both puzzles are Numberlink, contributed by POTS and Guten.

Announcement of the maintenance work Dec 12, 2011

from Fri, Dec. 16th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Shikaku and Sudoku puzzles to The pick of the puzzles page Dec 2, 2011

Most popular Shikaku and Sudoku puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 124th nikoli.com Puzzle Championship Dec 2, 2011

Congratulations! vanillaice won the 124th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship, the last championship of this year, will be Fri. Dec 16, 12:00 (UTC). We will set 2 kind of the time trial problem at the same time. Both puzzles are Numberlink, contributed by POTS and Guten.

124th Puzzle Championship Dec 1, 2011

Puzzle Championship nikoli.com holds 124th puzzle championships on our members page on Fri. Dec 2, 2011 12:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 123rd nikoli.com Puzzle ChampionshipNov 18, 2011

Congratulations! uri@now won the 123rd Puzzle Championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Dec 2, 2011 12:00 (UTC) and the time trial problem will be a Yajilin puzzle contributed by aspirin.

Author interviews Vol.29Nov 28, 2011

POTS is a veteran puzzle author and has made a lot of unique problems. Especially a lot of Numberlink. He contributes many Numberlink puzzles to nikoli.com.

Maintenance finished Nov 18, 2011

About 20 minutes after 05:00 Nov 18, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

123rd Puzzle Championship Nov 17, 2011

Puzzle Championship nikoli.com holds 123rd puzzle championships on our members page on Fri. Nov 18, 2011 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Nov 14, 2011

mimic's Slitherlink problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Announcement of the maintenance work Nov 14, 2011

from Fri, Nov. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 122nd nikoli.com Puzzle ChampionshipNov 4, 2011

Congratulations! NTKS won the 122nd Puzzle Championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Nov 18, 2011 13:00 (UTC) and the time trial problem will be a Slitherlink puzzle contributed by T.Karino.

122nd Puzzle Championship Nov 3, 2011

Puzzle Championship nikoli.com holds 122nd puzzle championships on our members page on Fri. Nov 4, 2011 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Nurikabe and Numberlink puzzles to The pick of the puzzles page Nov 2, 2011

Most popular Nurikabe and Numberlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 121st nikoli.com Puzzle Championship Oct 22, 2011

Congratulations! moka36 won the 121st puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Nov 4, 2011 13:00 (UTC) and the time trial problem will be a Ripple Effect puzzle contributed by T.Karino.

121st Puzzle Championship Oct 21, 2011

Puzzle Championship nikoli.com holds 121st puzzle championships on our members page on Sat. Oct 22 at 01:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Oct 21, 2011

About 25 minutes after 05:00 Oct 21, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Oct 17, 2011

from Fri, Oct. 21th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Results of the Nikoli Derby - 10th world championship Oct 13, 2011

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 10th world championship.

We hope you are one of the winners!

Author interviews Vol.28Oct 11, 2011

cubic function is a senior at a university in the Kansai area. He is very young!

Result of the 120th nikoli.com Puzzle Championship Oct 8, 2011

Congratulations! mizuike won the 120th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Oct 22, 2011 01:00 (UTC) and the time trial problem will be a Kakuro puzzle contributed by aiko.

Entry to The Nikoli Derby was closed Oct 7, 2011

We will announce the ranking of all participants of the 10th Nikoli Derby on Thu. Oct 13th.

120th Puzzle Championship Oct 7, 2011

Puzzle Championship nikoli.com holds 120th puzzle championships on our members page on Sat. Oct 8 at 01:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Slitherlink and Yajilin puzzles to The pick of the puzzles page Oct 3, 2011

Most popular Slitherlink and Yajilin puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

The Nikoli Derby - 10th world championship will soon be closed.Oct 3, 2011

The Nikoli Derby - 10th world championship Entry to The Nikoli Derby - 10th world championship will soon be closed. The winners will get an original nikoli goods. Make sure you enter. Deadline Fri. Oct 7, 3:00(UTC)

Result of the 119th nikoli.com Puzzle Championship Sep 24, 2011

Congratulations! MOMO won the 119th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Oct 8, 2011 01:00 (UTC) and the time trial problem will be a Akari puzzle contributed by Guten.

119th Puzzle Championship Sep 23, 2011

Puzzle Championship nikoli.com holds 119th puzzle championships on our members page on Sat. Sep 24 at 01:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Sep 16, 2011

SAKAMOTO, Nobuyuki's Nurikabe problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Sep 16, 2011

About 80 minutes after 05:00 Sep 16, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Sep 12, 2011

from Fri, Sep. 16th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 118th nikoli.com Puzzle Championship Sep 10, 2011

Congratulations! wakky won the 118th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

118th Puzzle Championship Sep 9, 2011

Puzzle Championship nikoli.com holds 118th puzzle championships on our members page on Sat. Sep 10 at 01:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Hitori, Kakuro and Ripple Effect puzzles to The pick of the puzzles page Sep 2, 2011

Most popular Hitori, Kakuro and Ripple Effect puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

The Nikoli Derby - 10th world championship Aug 31, 2011

The Nikoli Derby - 10th world championship Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or various nikoli original goods.

Result of the 117th nikoli.com Puzzle Championship Aug 27, 2011

Congratulations! RichardRoe won the 117th puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Sep 10, 2011 01:00 (UTC) and the time trial problem will be a Hitori puzzle contributed by Guten.

117th Puzzle Championship Aug 26, 2011

Puzzle Championship nikoli.com holds 117th puzzle championships on our members page on Sat. Aug 27 at 01:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Aug 19, 2011

About 20 minutes after 05:00 Aug 19, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Author interviews Vol.27Aug 18, 2011

T. Karino is in his early 60s. He is retired from his job now, but he used to work as a computer engineer in his working days. He said that he climbs mountains with the money he makes by his puzzles.

Announcement of the maintenance work Aug 15, 2011

from Fri, Aug. 19th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

116th Puzzle Championship Aug 12, 2011

Puzzle Championship nikoli.com holds 116th puzzle championships on our members page on Sat. Aug 13 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Aug 8, 2011

nyoroppyi's Heyawake problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Aug 2, 2011

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 115th nikoli.com Puzzle Championship Jul 31, 2011

Congratulations to jyokun! jyokun won the 115th puzzle championship! jyokun's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sat. Aug 13, 2011 13:00 (UTC) and the time trial problem will be a Shikaku puzzle contributed by Guten.

Result of the 114th nikoli.com Puzzle Championship Jul 17, 2011

Congratulations to aji! aji won the 114th puzzle championship! aji's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jul 31, 2011 13:00 (UTC) and the time trial problem will be a Nurikabe puzzle contributed by Asaokitan.

Maintenance finished Jul 15, 2011

About 25 minutes after 05:00 Jul 15, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Jul 12, 2011

from Fri, Jul. 15th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Author interviews Vol.26Jul 6, 2011

NyanBaz is on the staff of Nikoli. His work involves the management of the mobile site. He says that the work is very interesting.

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jul 4, 2011

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 113th nikoli.com Puzzle Championship Jun 30, 2011

Congratulations to pisaca! pisaca won the 113th puzzle championship! pisaca's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jul 17, 2011 13:00 (UTC) and the time trial problem will be a Yajilin puzzle contributed by aiko.

Added a new question and answer to FAQ page.Jun 29, 2011

We added a new question "Is it a "real hard" problem?" and answer to FAQ page.

Result of the 112th nikoli.com Puzzle Championship Jun 16, 2011

Congratulations to OLAKE! OLAKE won the 112th puzzle championship! OLAKE's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Thu. Jun 30, 2011 13:00 (UTC) and the time trial problem will be a Slitherlink puzzle contributed by Casty.

Announcement of the maintenance work Jun 13, 2011

from Fri, Jun. 17th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Jun 9, 2011

45's Hashiwokakero problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 111th nikoli.com Puzzle Championship Jun 2, 2011

Congratulations to MOR! MOR won the 111th puzzle championship! MOR's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Thu. Jun 16, 2011 13:00 (UTC) and the time trial problem will be a Heyawake puzzle contributed by Guten.

Added Shikaku and Sudoku puzzles to The pick of the puzzles page Jun 1, 2011

Most popular Shikaku and Sudoku puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Author interviews Vol.25May 23, 2011

Nyoroppyi is a 21-year-old man. He is a young author who only recently came to contribute problems to nikoli.com and the mobile site.

Result of the 110th nikoli.com Puzzle Championship May 20, 2011

Congratulations to kurocchi! kurocchi won the 110th puzzle championship! kurocchi's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

Maintenance finished May 20, 2011

About 20 minutes after 05:00 May 20, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work May 19, 2011

from Fri, May. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Nurikabe and Numberlink puzzles to The pick of the puzzles page May 2, 2011

Most popular Nurikabe and Numberlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 109th nikoli.com Puzzle Championship Apr 22, 2011

Congratulations to rorobo! rorobo won the 109th puzzle championship! rorobo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. May 20, 2011 13:00 (UTC) and the time trial problem will be a Hashiwokakero puzzle contributed by T.Karino.

Result of the 109th nikoli.com Puzzle Championship Apr 22, 2011

Congratulations to rorobo! rorobo won the 109th puzzle championship! rorobo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. May 20, 2011 13:00 (UTC) and the time trial problem will be a Hashiwokakero puzzle contributed by T.Karino.

Author interviews Vol.24Apr 20, 2011

Ikako is a late 20s woman. She has just married this year. She is a regular writer and has contributed to Nikoli since she was a junior high school student.

Results of the 1st Straight Flush Game Apr 13, 2011

Straight Flush is a simple and easy game. You just guess and write down the phrases that the most people will imagine.

Look here for the results of the 1st Straight Flush Game.

Sorry, we made a mistake when we calculate the results. We updated results page on Apr 13, 06:20(UTC).

Added Slitherlink and Yajilin puzzles to The pick of the puzzles page Apr 2, 2011

Most popular Slitherlink and Yajilin puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

The earthquake impact Mar 14, 2011

Thank you for your concern for us. nikoli.com don't have any serious problem. But the status of the power supply in Japan is unstable. We are sorry when you can't access to our site.

110th Puzzle Championship May 19, 2011

nikoli.com holds 110th puzzle championships on our members page on Fri. May 20 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Ripple Effect!! Mar 10, 2011

Sample problems of Ripple Effect puzzle nikoli.com started to release Ripple Effect puzzles in the members area from Mar 10th(JST).

Keep checking what may go and filling in, cell by cell. The feeling of accomplishment when there are no more empty cells!

Results of the 5th Minority Decides Game Feb 9, 2011

The Minority Decides is a nikoli original easygoing party game.

Look here for the results of the 5th Minority Decides Game.

109th Puzzle Championship Apr 21, 2011

nikoli.com holds 109th puzzle championships on our members page on Fri. Apr 22 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Apr 15, 2011

About 15 minutes after 05:00 Apr 15, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Apr 13, 2011

from Fri, Apr. 15th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Entry to The Straight Flush was closed Apr 10, 2011

Entry to The Straight Flush was closed on Tue. Apr 5, 15:00(UTC).

We will announce the ranking of all participants of The Straight Flush on Wed. Apr 13th.

Result of the 108th nikoli.com Puzzle Championship Apr 8, 2011

The winners of the puzzle championship vol.108 are sunanekoroom (Numberlink), Ziti (Kakuro) and detuned (Sudoku), Congratulations! Their names are now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Apr 22, 2011 13:00 (UTC) and the time trial problem is a Masyu puzzle that was contributed by Casty.

Added Botsu Bako problem Mar 25, 2011

Guten's Akari problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

108th Puzzle Championship Apr 7, 2011

nikoli.com holds 108th puzzle championships on our members page on Fri. Apr 8 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

We will set 3 kind of problems at the same time. POTS's Numberlink, Ryohei Nakai's Kakuro and SAKAMOTO, Nobuyuki's Sudoku are waiting for your challenge.

Result of the 107th nikoli.com Puzzle Championship May 18, 2011

Congratulations to nyoroppyi! nyoroppyi won the 107th puzzle championship! nyoroppyi's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be Fri. Apr 8, 13:00 (UTC). We will set 3 kind of problems at the same time.

Maintenance finished Mar 18, 2011

About 14 minutes after 05:00 Mar 18, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

107th Puzzle Championship Mar 17, 2011

nikoli.com holds 107th puzzle championships on our members page on Fri. Mar 18 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.23Mar 16, 2011

Gori.sh is a 30-something bachelor. His day job is a computer programmer.

He is great at solving puzzles quickly. He is active in many competitions.

Announcement of the maintenance work Mar 15, 2011

from Fri, Mar. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Server maintenance Mar 11, 2011

from Wed, Mar. 14th 00:00(UTC), a few hours

Apologies. Due to the server maintenance (upgrade) you won't be able to access the Everybody's page of nikoli.com during the above time.

Ripple Effect sample problems added Mar 5, 2011

Ripple Effect puzzle nikoli.com now has 10 sample problems of Ripple Effect puzzles. The 2 added problems are "Hard". Give them a try. Can you already solve hard Ripple Effect problems?

nikoli.com will start to release Ripple Effect puzzles in the members area from Mar 10th 2011.

Result of the 106th nikoli.com Puzzle Championship Mar 4, 2011

Congratulations to motris! motris won the 106th puzzle championship! motris's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Mar 18, 2011 13:00 (UTC) and the time trial problem is a Shikaku puzzle that was contributed by Ryohei Nakai.

Added Hitori and Kakuro puzzles to The pick of the puzzles page Mar 1, 2011

Most popular Hitori and Kakuro puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Ripple Effect sample problems added Feb 25, 2011

Sample problems of Ripple Effect  puzzle

nikoli.com now has 8 sample problems of Ripple Effect puzzles. The difficulty of the 3 added problems are "Medium". Give them a try.

nikoli.com will start to release Ripple Effect puzzles in the members area from March 10th 2011.

106th Puzzle Championship Mar 3, 2011

nikoli.com holds 106th puzzle championships on our members page on Fri. Mar 4 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Feb 22, 2011

akasyo's Kakuro problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Feb 18, 2011

About 35 minutes after 05:00 Feb 18, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Result of the 105th nikoli.com Puzzle Championship Feb 18, 2011

Congratulations to pocket! pocket won the 105th puzzle championship! pocket's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Mar 4, 2011 13:00 (UTC) and the time trial problem is a Nurikabe puzzle that was contributed by juno.

105th Puzzle Championship Feb 17, 2011

nikoli.com holds 105th puzzle championships on our members page on Fri. Feb 18 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

First round of "Straight Flush" - the word game Feb 17, 2011

Now we are holding a "Straight Flush" game, an updated "Flush game". "Straight Flush" is almost the same as "Flush": write down the five (the number of phrases has increased from four) phrases that popped into your head.

Announcement of the maintenance work Feb 16, 2011

from Fri, Feb. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

13th puzzle of nikoli.com is Ripple Effect Feb 10, 2011

Sample problems of Ripple Effect  puzzle nikoli.com will start publishing Ripple Effect puzzles in our members area from March. Try out the sample puzzles of Ripple Effect to get to know this wonderful puzzle.

The job is to fill in numbers in blank cells by the rules. Keep checking what may go and filling in, cell by cell.

Result of the 104th nikoli.com Puzzle Championship Feb 4, 2011

Congratulations to MellowMelon! MellowMelon won the 104th puzzle championship! MellowMelon's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Feb 18, 2011 13:00 (UTC) and the time trial problem is a Yajilin puzzle that was contributed by nyoroppyi.

104th Puzzle Championship Feb 3, 2011

nikoli.com holds 104th puzzle championships on our members page on Fri. Feb 4 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.22Feb 2, 2011

Aiko is married, working in a small company. He himself started from solving puzzles, and came to make them. He got engrossed in puzzles.

Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Feb 1, 2011

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Entry to The 5th Minority Decides was closed Feb 1, 2011

We will announce the result of The Minority Decides on Wed. Feb 9th.

Result of the 103rd nikoli.com Puzzle Championship Jan 21, 2011

Congratulations to Sphinx! Sphinx won the 103rd puzzle championship! Sphinx's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Feb 4, 2011 13:00 (UTC) and the time trial problem is a Hitori puzzle that was contributed by nyoroppyi.

Maintenance finished Jan 21, 2011

About 16 minutes after 05:00 Jan 21, 2011(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Entry to the "Minority Decides" game will soon be closed Jan 20, 2011

The Minority Decides GameThis is a nikoli original easygoing party game. To take part you choose "yes" or "no" for the questions. If your answer is the same as the minority of players, you survive and go on to the next round. So this game is a litmus test for your sense of what is normal (and sticking with the underdog!).

Deadline: Mon. Jan 31, 15:00(UTC)

103rd Puzzle Championship Jan 20, 2011

nikoli.com holds 103rd puzzle championships on our members page on Fri. Jan 21 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Jan 18, 2011

from Fri, Jan. 21st 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Jan 10, 2011

45's Hitori problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 102nd nikoli.com Puzzle Championship Jan 7, 2011

Congratulations to H.Jo! H.Jo won the 102nd puzzle championship! H.Jo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 21, 2011 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by Guten.

102nd Puzzle Championship Jan 6, 2011

nikoli.com holds 102nd puzzle championships on our members page on Fri. Jan 7 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jan 5, 2011

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 101st nikoli.com Puzzle Championship Dec 24, 2010

Congratulations to MOR! MOR won the 101st puzzle championship! MOR's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 7, 2011 13:00 (UTC) and the time trial problem is a Heyawake puzzle that was contributed by Aiko.

101st Puzzle Championship Dec 23, 2010

nikoli.com holds 101st puzzle championships on our members page on Fri. Dec 24 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

The 5th Minority Decides Game Dec 22, 2010

The Minority Decides Game This is a nikoli original easygoing party game. To take part you choose "yes" or "no" for the questions at the entry page. The winner will receive an original Nikoli T-shirt.

Maintenance finished Dec 17, 2010

About 14 minutes after 05:00 Dec 17, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Results of the Nikoli Derby - 9th world championship Dec 15, 2010

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 9th world championship.

We hope you are one of the winners!

Announcement of the maintenance work Dec 15, 2010

from Fri, Dec. 17th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 100th nikoli.com Puzzle Championship Dec 10, 2010

The winners of the puzzle championship vol.100 are oriori (Hashiwokakero), Casty (Numberlink) and motris (Kakuro), Congratulations! Their names are now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be Fri. Dec 24, 13:00 (UTC). The puzzle will be a 45x31 Extra Hard Akari created by T.Karino.

100th Puzzle Championship Dec 9, 2010

nikoli.com holds 100th puzzle championships on our members page on Fri. Dec 10 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

We will set 3 kind of problems at the same time. 45's Hashiwokakero, Guten's Numberlink and T.Karino's Kakuro are waiting for your challenge.

Entry to The Nikoli Derby was closed Dec 8, 2010

We will announce the ranking of all participants of the 9th Nikoli Derby on Wed. Dec 15th.

Sorry for the access failureDec 7, 2010

We are sorry. Because of the server trouble, you could not able to get access to the nikoli.com everybody's pages from 05:05 to 07:30(UTC).

Author interviews Vol.21Dec 6, 2010

Juno is one of the operation staff of nikoli.com. He says that he is the Nikoli staff member who loves cats most.

The Nikoli Derby - 9th world championship will soon be closed.Dec 2, 2010

The Nikoli Derby - 9th world championship Entry to The Nikoli Derby - 9th world championship will soon be closed. The winners will get an original nikoli goods. Make sure you enter. Deadline Tue. Dec 7, 15:00(UTC)

Added Shikaku and Sudoku puzzles to The pick of the puzzles page Dec 1, 2010

Most popular Shikaku and Sudoku puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 99th nikoli.com Puzzle Championship Nov 26, 2010

Congratulations to Caltan! Caltan won the 99th puzzle championship! Caltan's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next, 100th puzzle championship will be Fri. Dec 10, 13:00 (UTC).

We will set 3 kind of problems at the same time. 45's Hashiwokakero, Guten's Numberlink and T.Karino's Kakuro are waiting for your challenge.

99th Puzzle Championship Nov 25, 2010

nikoli.com holds 99th puzzle championships on our members page on Fri. Nov 26 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Nov 19, 2010

aspirin's Slitherlink problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Nov 19, 2010

About 1 hour and 20 minutes after 05:00 Nov 19, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

iPhone/iPod touch application: "Sudoku by Nikoli" released Nov 18, 2010

Sudoku applications for the iPhone/iPod touch Nikoli released a Sudoku application for iPhone, iPod Touch, and iPad! The name of the application is "Sudoku by Nikoli", You can purchase and add problem collections that contain dozens of Sudoku puzzles at the App Store, via the "Sudoku by Nikoli" application. If you like these original Nikoli Sudoku puzzles, we are confident you will also enjoy the new problem collections you add.

Announcement of the maintenance work Nov 15, 2010

from Fri, Nov. 19th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 98th nikoli.com Puzzle Championship Nov 12, 2010

Congratulations to tala! tala won the 98th puzzle championship! tala's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Nov 12, 2010 13:00 (UTC) and the time trial problem is a Masyu puzzle that was contributed by juno.

98th Puzzle Championship Nov 11, 2010

nikoli.com holds 98th puzzle championships on our members page on Fri. Nov 12 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Nurikabe and Numberlink puzzles to The pick of the puzzles page Nov 1, 2010

Most popular Nurikabe and Numberlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 97th nikoli.com Puzzle Championship Oct 29, 2010

Congratulations to moka36! moka36 won the 97th puzzle championship! moka36's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Nov 12, 2010 13:00 (UTC) and the time trial problem is a Shikaku puzzle that was contributed by T.Karino.

97th Puzzle Championship Oct 28, 2010

nikoli.com holds 97th puzzle championships on our members page on Fri. Oct 29 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.20Oct 27, 2010

Guten is an office worker. He is a regular contributor to Puzzle Communication Nikoli, but he is a newcomer in nikoli.com, from December 2008.

The Nikoli Derby - 9th world championship Oct 21, 2010

The Nikoli Derby - 9th world championship Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Result of the 96th nikoli.com Puzzle Championship Oct 15, 2010

Congratulations to hijiring! hijiring won the 96th puzzle championship! hijiring's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Oct 15, 2010 13:00 (UTC) and the time trial problem is a Nurikabe puzzle that was contributed by Ogawa Minori.

Maintenance finished Oct 15, 2010

About 13 minutes after 05:00 Oct 15, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

96th Puzzle Championship Oct 14, 2010

nikoli.com holds 96th puzzle championships on our members page on Fri. Oct 15 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Oct 12, 2010

from Fri, Oct. 15th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Oct 8, 2010

MINE's Nurikabe problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 95th nikoli.com Puzzle Championship Oct 1, 2010

Congratulations to aji! aji won the 95th puzzle championship! aji's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Oct 15, 2010 13:00 (UTC) and the time trial problem is a Yajilin puzzle that was contributed by YukiHiro.

95th Puzzle Championship Sep 30, 2010

nikoli.com holds 95th puzzle championships on our members page on Fri. Oct 1 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the 3rd Flush Game Sep 29, 2010

Flush is a simple and easy game. You just guess and write down the phrases that the most people will imagine.

Look here for the results of the 3rd Flush Game.

Entry to The Flush was closed Sep 22, 2010

We will announce the ranking of all participants of The Flush on Wed. Sep 29th.

Maintenance finished Sep 17, 2010

About 13 minutes after 05:00 Sep 17, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Result of the 94th nikoli.com Puzzle Championship Sep 17, 2010

Congratulations to pocket! pocket won the 94th puzzle championship! pocket's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 31, 2010 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by Momotereu.

94th Puzzle Championship Sep 16, 2010

nikoli.com holds 94th puzzle championships on our members page on Fri. Sep 17 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.19Sep 15, 2010

Hammy is a man in his 30s. He is married. He has work related to computers.

Entry to the "Flush" game will soon be closed Sep 13, 2010

This is a simple and easy game. You just guess and write down the phrases that the most people will imagine. Please remember that what pops into your head maybe occurs to no body else.

Deadline: Tue. Sep 21, 15:00(UTC)

Announcement of the maintenance work Sep 13, 2010

from Fri, Sep. 17th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Slitherlink and Yajilin puzzles to The pick of the puzzles page Oct 4, 2010

Most popular Slitherlink and Yajilin puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 93rd nikoli.com Puzzle Championship Sep 3, 2010

Congratulations to Alan! Alan won the 93rd puzzle championship! Alan's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 17, 2010 13:00 (UTC) and the time trial problem is a Heyawake puzzle that was contributed by Guten.

93rd Puzzle Championship Sep 2, 2010

nikoli.com holds 93rd puzzle championships on our members page on Fri. Sep 3 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Hitori and Kakuro puzzles to The pick of the puzzles page Sep 1, 2010

Most popular Hitori and Kakuro puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Added Botsu Bako problem Aug 30, 2010

Ryohei Nakai's Heyawake problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 92nd nikoli.com Puzzle Championship Aug 20, 2010

Congratulations to detuned! detuned won the 92nd puzzle championship! detuned's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 3, 2010 13:00 (UTC) and the time trial problem is a Hitori puzzle that was contributed by Casty.

Maintenance finished Aug 20, 2010

About 12 minutes after 05:00 Aug 20, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

92nd Puzzle Championship Aug 19, 2010

nikoli.com holds 92nd puzzle championships on our members page on Fri. Aug 20 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Aug 17, 2010

from Fri, Aug. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Third round of "Flush" - the word game Aug 11, 2010

Third round of Flush - the word gameThis is a simple and easy game. You just guess and write down the phrases that the most people will imagine. Please remember that what pops into your head maybe occurs to no body else. The winner will receive an original Nikoli T-shirt.

Author interviews Vol.18Aug 9, 2010

Kushimaru is a man in his 40s. He is a Nikoli staff member from way back and he is responsible for nikoli.com and mobile-nikoli.com. This time I was going to forget he is one of the staff, and just listen to a puzzle author talking, but . . .

Result of the 91st nikoli.com Puzzle Championship Aug 6, 2010

Congratulations to komami-! komami- won the 91st puzzle championship! komami-'s name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Aug 20, 2010 13:00 (UTC) and the time trial problem is a Sudoku puzzle that was contributed by Kumotan.

91st Puzzle Championship Aug 5, 2010

nikoli.com holds 91st puzzle championships on our members page on Fri. Aug 6 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the Nikoli Derby - 8th world championship Aug 3, 2010

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 8th world championship.

We hope you are one of the winners!

Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Aug 2, 2010

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Entry to The Nikoli Derby was closed Jul 28, 2010

We will announce the ranking of all participants of the 8th Nikoli Derby on Wed. Aug 4th.

Result of the 90th nikoli.com Puzzle Championship Jul 23, 2010

Congratulations to uri@now! uri@now won the 90th puzzle championship! uri@now's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Aug 6, 2010 13:00 (UTC) and the time trial problem is a Akari puzzle that was contributed by juno.

Maintenance finished Jul 23, 2010

About 15 minutes after 05:00 Jul 23, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

90th Puzzle Championship Jul 22, 2010

nikoli.com holds 90th puzzle championships on our members page on Fri. Jul 23 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

The Nikoli Derby - 8th world championship will soon be closed.Jul 21, 2010

Entry to The Nikoli Derby - 8th world championship will soon be closed. The winners will get an original nikoli goods. Make sure you enter. Deadline Tue. Jul 27, 15:00(UTC)

Announcement of the maintenance work Jul 21, 2010

from Fri, Jul. 23rd 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Jul 19, 2010

Guten's Hashiwokakero problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 89th nikoli.com Puzzle Championship Jul 9, 2010

Congratulations to catmask! catmask won the 89th puzzle championship! catmask's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jul 23, 2010 13:00 (UTC) and the time trial problem is a Masyu puzzle that was contributed by Guten.

89th Puzzle Championship Jul 8, 2010

nikoli.com holds 89th puzzle championships on our members page on Fri. Jul 9 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

The Nikoli Derby - 8th world championship Jul 5, 2010

Please join nikoli original easygoing party game The Nikoli Derby. Entry to the derby was started from Jun 18. The winners will receive an original Nikoli T-shirt or various nikoli original goods.

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jul 1, 2010

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Author interviews Vol.17Jun 29, 2010

Ryohei Nakai is a 23 year old graduate student. He seems to have studied optimization deeply. He is a computer programmer able to turn anything into code.

Result of the 88th nikoli.com Puzzle Championship Jun 25, 2010

Congratulations to sinh9! sinh9 won the 88th puzzle championship! sinh9's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jul 9, 2010 13:00 (UTC) and the time trial problem is a Hashiwokakero puzzle that was contributed by 45.

88th Puzzle Championship Jun 25, 2010

nikoli.com holds 88th puzzle championships on our members page on Fri. Jun 25 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

The Nikoli Derby - 8th world championship Jun 18, 2010

Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or various nikoli original goods.

Maintenance finished Jun 18, 2010

About 15 minutes after 05:00 Jun 18, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Jun 15, 2010

from Fri, Jun. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 87th nikoli.com Puzzle Championship Jun 11, 2010

Congratulations to Sphinx! Sphinx won the 87th puzzle championship! Sphinx's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jun 25, 2010 13:00 (UTC) and the time trial problem is a Numberlink puzzle that was contributed by Casty.

87th Puzzle Championship Jun 10, 2010

nikoli.com holds 87th puzzle championships on our members page on Fri. Jun 11 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 86th nikoli.com Puzzle Championship Jun 11, 2010

Congratulations to MellowMelon! MellowMelon won the 86th puzzle championship! MellowMelon's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jun 11, 2010 13:00 (UTC) and the time trial problem is a Kakuro puzzle that was contributed by akasyo.

Added Botsu Bako problem Jun 7, 2010

nyoroppyi's Extra Hard Akari problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Shikaku and Sudoku puzzles to The pick of the puzzles page Jun 1, 2010

Most popular Shikaku and Sudoku puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

86th Puzzle Championship May 27, 2010

nikoli.com holds 86th puzzle championships on our members page on Fri. May 28 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.16May 26, 2010

Momotereu is a 26-year-old bachelor. He was working as a regular contributor for many years, and he joined us last year, a promising young employee.

3.456789th Anniversary Week! May 17, 2010

We make publication schedule of puzzles in the members area to entertain many of our members as possible as we can, not to sequence same puzzles, difficulties and authors.

However, the rich puzzles sometimes center in the same timing, like last ten days of this May.

This is good opportunity for the anniversary for nikoli.com. May 25 17:28:18(JST) just celebrates the 3.456789th anniversary of nikoli.com.

We will release giant or extra hard puzzles everyday from May 23 to May 30(JST). Please enjoy these rich puzzles as much as you like.

We also release easy puzzles for non-members everyday from May 22 to Jun 1. All the people who visit our site can enjoy these puzzles. Please join our membership when you would like to enjoy more puzzles.

Result of the 85th nikoli.com Puzzle Championship May 14, 2010

Congratulations to MOMO! MOMO won the 85th puzzle championship! MOMO's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. May 28, 2010 13:00 (UTC) and the time trial problem is a Shikaku puzzle that was contributed by Ogawa Minori.

Maintenance finished May 21, 2010

About 11 minutes after 05:00 May 21, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work May 17, 2010

from Fri, May. 21st 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

85th Puzzle Championship May 13, 2010

nikoli.com holds 85th puzzle championships on our members page on Fri. May 14 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Nurikabe and Numberlink puzzles to The pick of the puzzles page May 6, 2010

Most popular Nurikabe and Numberlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

May 1st was Easy Puzzle Day May 2, 2010

nikoli.com published EASY puzzles of all 12 kinds at 2 minute intervals from May 1, 2010 16:00(UTC), in the members page. All of the 12 puzzles are very easy, so please try to challenge your solution skills and solve them all. Maybe you will find the puzzles that usually don't suit you are fun too.

Everybody who visits the members area can solve these 12 puzzles.

Result of the 84th nikoli.com Puzzle Championship Apr 30, 2010

Congratulations to mearas! mearas won the 84th puzzle championship! mearas's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. May 14, 2010 13:00 (UTC) and the time trial problem is a Nurikabe puzzle that was contributed by Guten.

84th Puzzle Championship Apr 29, 2010

nikoli.com holds 84th puzzle championships on our members page on Fri. Apr 30 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

May 1st is Easy Puzzle Day Apr 24, 2010

We will release EASY puzzles of all 12 kinds at 2 minute intervals from May 1, 2010 14:00(UTC) in the members page of nikoli.com. So there will be 12 easy puzzles, and please try to solve the puzzles that don't usually suit you.

Everybody who visits the members area will be able to solve these 12 puzzles but only members can save their solution history of the puzzles.

Author interviews Vol.15Apr 22, 2010

MINE is a 32-year-old male, and a company employee. He is working in an environment where 90% oxygen can be breathed in at any time. Maybe because of that his lung age is 23.

The Japanese pen name of MINE is "Aburamushi", and the interview uses that pen name.

Added Botsu Bako problem Apr 19, 2010

mimic's Extra Hard Kakuro problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 83rd nikoli.com Puzzle Championship Apr 16, 2010

Congratulations to H.Jo! H.Jo won the 83rd puzzle championship! H.Jo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Apr 30, 2010 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by Komieda.

Maintenance finished Apr 16, 2010

05:00-06:05 Apr 16, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

83rd Puzzle Championship Apr 15, 2010

nikoli.com holds 83rd puzzle championships on our members page on Fri. Apr 16 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Apr 13, 2010

from Fri, Apr. 16th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

iPhone/iPod application by Nikoli: "Nurikabe" Apr 12, 2010

Shikaku applications for the iPhone/iPod touch There is now a Nurikabe Free, the 8th iPhone/iPod application by Nikoli. Akari and Shikaku have already been released and now you can play Nurikabe puzzles on your iPhone/iPod!

Yajilin!! Apr 10, 2010

Sample problems of Yajilin puzzle nikoli.com started to release Yajilin puzzles in the members area from Apr 10th(JST).

Yajilin is an original Nikoli puzzle that was first featured in Puzzle Communication Nikoli Vol. 115 (June, 2006).

Yajilin sample problems added Apr 5, 2010

nikoli.com now has 10 sample problems of Yajilin puzzles. The 2 added problems are "Hard" and the size is 36x20. Give them a try. Can you already solve hard Yajilin problems?

nikoli.com will start to release Yajilin puzzles in the members area from Apr 10th 2010.

Added Slitherlink puzzles to The pick of the puzzles page Apr 3, 2010

Most popular Slitherlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 82nd nikoli.com Puzzle Championship Apr 2, 2010

Congratulations to nyoroppyi! nyoroppyi won the 82nd puzzle championship! nyoroppyi's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Apr 16, 2010 13:00 (UTC) and the time trial problem is a Heyawake puzzle that was contributed by NyanBaz.

7th iPhone/iPod application by Nikoli Mar 29, 2010

Shikaku applications for the iPhone/iPod touch Nikoli has now made Shikaku #2 released on 29th March!

Shikaku #2 has 50 Shikaku puzzles, from easy to hard. It will entertain everyone, from beginner or expert. If you are not yet sure you wish to download Shikaku #2, try out Shikaku Free, with free Shikaku puzzles. We are sure you will enjoy the Shikaku apps.

Yajilin sample problems added Mar 26, 2010

nikoli.com now has 8 sample problems of Yajilin puzzles. The 3 added problems are "Medium" and "Hard". Give them a try. Can you already solve hard Yajilin problems?

nikoli.com will start to release Yajilin puzzles in the members area from April 10th 2010.

Result of the 81st nikoli.com Puzzle Championship Mar 19, 2010

Congratulations to kurocchi! kurocchi won the 81st puzzle championship! kurocchi's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Apr 2, 2010 13:00 (UTC) and the time trial problem is a Akari puzzle that was contributed by aiko.

Maintenance finished Mar 19, 2010

About 15 minutes after 05:00 Mar 19, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

81st Puzzle Championship Mar 18, 2010

nikoli.com holds 81st puzzle championships on our members page on Fri. Mar 19 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.14Mar 17, 2010

OLAKE is young but has a long history as a puzzle author. He says that his occupation is to grapple with figures - numbers.

Announcement of the maintenance work Mar 16, 2010

from Fri, Mar. 19th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

6th iPhone/iPod application by Nikoli Mar 15, 2010

Shikaku applications for the iPhone/iPod touch Nikoli has now made Shikaku #1 released on 15th March!

Shikaku #1 has 50 Shikaku puzzles, from easy to hard. It will entertain everyone, from beginner or expert. If you are not yet sure you wish to download Shikaku #1, try out Shikaku Free, with free Shikaku puzzles. We are sure you will enjoy the Shikaku apps.

12th puzzle of nikoli.com is Yajilin Mar 12, 2010

Sample problems of Yajilin puzzle nikoli.com will start publishing Yajilin puzzles in our members area from April. Try out the sample puzzles of Yajilin to get to know this wonderful puzzle.

The job is to draw lines and to fill in cells by the rules. Check the numbers and lines carefully, up-down and across. This is how to solve Yajilin puzzles.

Results of the Nikoli Derby - 7th world championship Mar 10, 2010

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 7th world championship.

We hope you are one of the winners!

Added Botsu Bako problem Mar 7, 2010

45's Extra Hard Hitori problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 80th nikoli.com Puzzle Championship Mar 5, 2010

Congratulations to rorobo! rorobo won the 80th puzzle championship! rorobo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Mar 19, 2010 13:00 (UTC) and the time trial problem is a Hashiwokakero puzzle that was contributed by T.Karino.

80th Puzzle Championship Mar 4, 2010

nikoli.com holds 80th puzzle championships on our members page on Fri. Mar 5 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Entry to The Nikoli Derby was closed Mar 3, 2010

We will announce the ranking of all participants of the 7th Nikoli Derby on Wed. Mar 10th.

Shikaku iPhone/iPod touch application released Mar 2, 2010

Akari applications for the iPhone/iPod touch Nikoli has now made Shikaku applications for the iPhone/iPod touch. We have released a free edition at the App Store. If you have iPhone or iPod touch, please try it out. The first regular edition (#1) will be released around the middle of March.

Added Hitori and Kakuro puzzles to The pick of the puzzles page Mar 1, 2010

Most popular Hitori and Kakuro puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

The Nikoli Derby - 7th world championship will soon be closed.Mar 1, 2010

Entry to The Nikoli Derby - 7th world championship will soon be closed. The winners will get an original nikoli goods. Make sure you enter. Deadline Tue. Mar 2, 15:00(UTC)

Result of the 79th nikoli.com Puzzle Championship Feb 19, 2010

Congratulations to Melvy! Melvy won the 79th puzzle championship! Melvy's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Mar 5, 2010 13:00 (UTC) and the time trial problem is a Masyu puzzle that was contributed by crimson.

Maintenance finished Feb 19, 2010

About 15 minutes after 05:00 Feb 19, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

79th Puzzle Championship Feb 18, 2010

nikoli.com holds 79th puzzle championships on our members page on Fri. Feb 19 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.13Feb 16, 2010

akasyo's Japanese pen name is "Akasyoubin". That is the name for the Ruddy Kingfisher (ruddy is the color here). That is a beautiful wild bird living in Japan, and he really likes birds. He is in his late 30s. He is married. And he is an engineer working with a manufacturer.

Announcement of the maintenance work Feb 15, 2010

from Fri, Feb. 19th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 78th nikoli.com Puzzle Championship Feb 5, 2010

Congratulations to Ziti! Ziti won the 78th puzzle championship! Ziti's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Feb 19, 2010 13:00 (UTC) and the time trial problem is a Hitori puzzle that was contributed by 45.

78th Puzzle Championship Feb 4, 2010

nikoli.com holds 78th puzzle championships on our members page on Fri. Feb 5 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Feb 2, 2010

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

The Nikoli Derby - 7th world championship Jan 25, 2010

Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Author interviews Vol.12Jan 25, 2010

Ogawa Minori is a 30-something bachelor. His day job is as a salaried employee. Where he works, he is in charge of accounting.

Result of the 77th nikoli.com Puzzle Championship Jan 22, 2010

Congratulations to merrilin! merrilin won the 77th puzzle championship! merrilin's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Feb 5, 2010 13:00 (UTC) and the time trial problem is a Kakuro puzzle that was contributed by T.Karino.

77th Puzzle Championship Jan 21, 2010

nikoli.com holds 77th puzzle championships on our members page on Fri. Jan 22 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Jan 17, 2010

SAKAMOTO, Nobuyuki's Medium Nurikabe problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

The Nikoli Derby - 7th world championship Jan 15, 2010

Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Maintenance finished Jan 15, 2010

About 15 minutes after 05:00 Jan 15, 2010(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Jan 12, 2010

from Fri, Jan. 15th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 76th nikoli.com Puzzle Championship Jan 8, 2010

Congratulations to sunanekoroom! sunanekoroom won the 76th puzzle championship! sunanekoroom's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 22, 2010 13:00 (UTC) and the time trial problem is a Shikaku puzzle that was contributed by Ryohei Nakai.

76th Puzzle Championship Jan 7, 2010

nikoli.com holds 76th puzzle championships on our members page on Fri. Jan 8 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jan 2, 2010

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 75th nikoli.com Puzzle Championship Dec 25, 2009

Congratulations to hijiring! hijiring won the 75th puzzle championship! hijiring's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 8, 2010 13:00 (UTC) and the time trial problem is a Numberlink puzzle that was contributed by Guten.

75th Puzzle Championship Dec 24, 2009

nikoli.com holds 75th puzzle championships on our members page on Fri. Dec 25 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Dec 18, 2009

Komieda's Hard Slitherlink problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Dec 18, 2009

About 10 minutes after 05:00 Dec 18, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Dec 15, 2009

from Fri, Dec. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 74th nikoli.com Puzzle Championship Dec 11, 2009

Congratulations to Sphinx! Sphinx won the 74th puzzle championship! Sphinx's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Dec 25, 2009 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by aiko.

Author interviews Vol.11Dec 10, 2009

Hone Rokuo is 27 years old, a bachelor. Height 183cm, body fat 4.7%. He is handsome, tall, and slim. His occupation is what he calls a free human being.

74th Puzzle Championship Dec 10, 2009

nikoli.com holds 74th puzzle championships on our members page on Fri. Dec 11 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Giant Puzzle Week! Dec 2, 2009

Dec 10 (JST [Dec 9 15:00 UTC]) celebrates the 3rd anniversary of nikoli.com. We have been running the site supported by pencil puzzle lovers from around the world, a big thank you to all of you for three exciting years.

nikoli.com wishes to express our gratitude to you all for your support. To celebrate, we will publish giant puzzles in the members area on 7 consecutive days from Dec 10. We hope you will enjoy them!

Added Shikaku and Sudoku puzzles to The pick of the puzzles page Dec 1, 2009

Most popular Shikaku and Sudoku puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 73rd nikoli.com Puzzle Championship Nov 27, 2009

Congratulations to takkkun! takkkun won the 73rd puzzle championship! takkkun's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Dec 11, 2009 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by aiko.

73rd Puzzle Championship Nov 26, 2009

nikoli.com holds 73rd puzzle championships on our members page on Fri. Nov 27 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Nov 20, 2009

About 20 minutes after 05:00 Nov 20, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Nov 16, 2009

from Fri, Nov. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 72nd nikoli.com Puzzle Championship Nov 13, 2009

Congratulations to aji! aji won the 72nd puzzle championship! aji's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Nov 27, 2009 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by aiko.

72nd Puzzle Championship Nov 12, 2009

nikoli.com holds 72nd puzzle championships on our members page on Fri. Nov 13 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Nov 5, 2009

mimic's Extra hard Heyawake problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

iPhone/iPod touch application released Nov 4, 2009

Akari applications for the iPhone/iPod touch Nikoli has now made Akari applications for the iPhone/iPod touch. We have released a free edition and three regular editions (#1, #2 and #3) at the App Store. If you have iPhone or iPod touch, please try it out.

Added Nurikabe and Numberlink puzzles to The pick of the puzzles page Nov 2, 2009

Most popular Nurikabe and Numberlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 71st nikoli.com Puzzle Championship Oct 30, 2009

Congratulations to Sphinx! Sphinx won the 71st puzzle championship! Sphinx's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Nov 13, 2009 13:00 (UTC) and the time trial problem is a Heyawake puzzle that was contributed by OLAKE.

71st Puzzle Championship Oct 29, 2009

nikoli.com holds 71st puzzle championships on our members page on Fri. Oct 30 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the 4th Minority Decides Game Oct 28, 2009

The Minority Decides is a nikoli original easygoing party game.

Look here for the results of the 4th Minority Decides Game.

Author interviews Vol.10Oct 26, 2009

Miya is a bachelor, age 31. His face is not known to the public. His employment is also not generally known, but He has leaked that it is office work. In college he majored in psychology. He was interested in social and cognitive psychology, but his university studying left much to be desired.

Miya's masterpiece, the Hitori is in the interview page.

20 Sudoku puzzles for free! Oct 23, 2009

nikoli.com now has 20 sample problems of Sudoku puzzles for free. All of them are new puzzles, especially prepared for nikoli.com Everybody's page. Take pleasure in the properly crafted nikoli original Sudoku puzzles.

Entry to The 4th Minority Decides was closed Oct 21, 2009

We will announce the result of The Minority Decides on Wed. Oct 28th.

Result of the 70th nikoli.com Puzzle Championship Oct 16, 2009

Congratulations to catmask! catmask won the 70th puzzle championship! catmask's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Oct 30, 2009 13:00 (UTC) and the time trial problem is a Akari puzzle that was contributed by crimson.

Maintenance finished Oct 16, 2009

About 40 minutes after 05:00 Oct 16, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

70th Puzzle Championship Oct 15, 2009

nikoli.com holds 70th puzzle championships on our members page on Fri. Oct 16 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Entry to the "Minority Decides" game will soon be closed Oct 14, 2009

This is a nikoli original easygoing party game. To take part you choose "yes" or "no" for the questions. If your answer is the same as the minority of players, you survive and go on to the next round. So this game is a litmus test for your sense of what is normal (and sticking with the underdog!).

Deadline: Tue. Oct 20, 15:00(UTC)

Announcement of the maintenance work Oct 13, 2009

from Fri, Oct. 16th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Slitherlink puzzles to The pick of the puzzles pageOct 3, 2009

Most popular Slitherlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Added Botsu Bako problem Oct 6, 2009

aspirin's Extra hard Masyu problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 69th nikoli.com Puzzle Championship Oct 2, 2009

Congratulations to aji! aji won the 69th puzzle championship! aji's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Oct 16, 2009 13:00 (UTC) and the time trial problem is a Hashiwokakero puzzle that was contributed by 45.

69th Puzzle Championship Oct 1, 2009

nikoli.com holds 69th puzzle championships on our members page on Fri. Oct 2 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 68th nikoli.com Puzzle Championship Sep 18, 2009

Congratulations to Psyho! Psyho won the 68th puzzle championship! Psyho's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Oct 2, 2009 13:00 (UTC) and the time trial problem is a Masyu puzzle that was contributed by aji.

Maintenance finished Sep 18, 2009

About 10 minutes after 05:00 Sep 18, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

68th Puzzle Championship Sep 17, 2009

nikoli.com holds 68th puzzle championships on our members page on Fri. Sep 18 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

The 4th Minority Decides Game Sep 15, 2009

This is a nikoli original easygoing party game. To take part you choose "yes" or "no" for the questions at the entry page. The winner will receive an original Nikoli T-shirt.

Announcement of the maintenance work Sep 14, 2009

from Fri, Sep. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Sep 7, 2009

45's Extra hard Hashiwokakero problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 67th nikoli.com Puzzle Championship Sep 4, 2009

Congratulations to moka36! moka36 won the 67th puzzle championship! moka36's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 18, 2009 13:00 (UTC) and the time trial problem is a Sudoku puzzle that was contributed by Casty.

67th Puzzle Championship Sep 3, 2009

nikoli.com holds 67th puzzle championships on our members page on Fri. Sep 4 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the Nikoli Derby - 6th world championship Sep 2, 2009

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 6th world championship.

Added Hitori and Kakuro puzzles to The pick of the puzzles pageSep 1, 2009

Most popular Hitori and Kakuro puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Entry to The Nikoli Derby was closed Aug 26, 2009

We will announce the ranking of all participants of The Nikoli Derby on Wed. Sep 2nd.

Result of the 66th nikoli.com Puzzle Championship Aug 21, 2009

Congratulations to uri@now! uri@now won the 66th puzzle championship! uri@now's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 4, 2009 13:00 (UTC) and the time trial problem is a Hitori puzzle that was contributed by Casty.

Maintenance finished Aug 21, 2009

About 50 minutes after 05:00 Aug 21, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

66th Puzzle Championship Aug 20, 2009

nikoli.com holds 66th puzzle championships on our members page on Fri. Aug 21 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Vol.9Aug 19, 2009

crimson is twenty one years old (in 2007). He is now studying the history of education and philosophy in the department of education of a university. His hobbies, other than puzzles, are reading and writing a mystery novel, and playing TV games.

The Nikoli Derby - 6th world championship Aug 18, 2009

Entry to The Nikoli Derby - 6th world championship will soon be closed. The winners will get an original nikoli goods. Make sure you enter. Deadline Tue. Aug 25, 15:00(UTC)

Announcement of the maintenance work Aug 18, 2009

from Fri, Aug. 21st 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Aug 5, 2009

Guten's Extra hard Akari problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Akari and Hashiwokakero puzzles to The pick of the puzzles pageAug 3, 2009

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

We will have summer vacation from Aug.12th to 17th. Aug 3, 2009

Our office will be closed, so your inquiry to nikoli.com during in this term will be respond after Aug.18th. Please kindly understand.

Result of the 65th nikoli.com Puzzle Championship Aug 1, 2009

The winners of the puzzle championship vol. 65 are H.Jo (Slitherlink), motris (Nurikabe) and monkeyfish (Shikaku), ! Congratulations! Their names are now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be Fri. Aug 21, 13:00 (UTC). The puzzle will be a 31x21 Extra Hard Kakuro created by aiko.

The Nikoli Derby - 6th world championship Jul 22, 2009

Entry to The Nikoli Derby - 6th world championship started on July 3rd. The winners will get an original nikoli goods. Make sure you enter.

65th Puzzle Championship Jul 31, 2009

nikoli.com holds 65th puzzle championships on our members page on Sat. Aug 1 at 04:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

We will set 3 kind of problems at the same time. Komieda's Slitherlink, juno's Nurikabe and Ogawa Minori's Shikaku are waiting for your challenge.

Result of the 64th nikoli.com Puzzle Championship Jul 24, 2009

Congratulations to takkkun! takkkun won the 64th puzzle championship! takkkun's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be Sat. Aug 1, 04:00 (UTC).

We will set 3 kind of problems at the same time. Komieda's Slitherlink, juno's Nurikabe and Ogawa Minori's Shikaku are waiting for your challenge.

64th Puzzle Championship Jul 23, 2009

nikoli.com holds 64th puzzle championships on our members page on Fri. Jul 24 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

One Layout Akaris Jul 17, 2009

One Layout Akaris Akari puzzles often show the authors' personalities in the layout of the hints. Then at Nikoli we thought that if we specify the layout, what differences in the flavor will the authors bring to the puzzles? And yes, we really tried it. We asked many authors to make a Akari puzzle based on the same layout, and here we have 21 of these puzzles.

Maintenance finished Jul 17, 2009

About 10 minutes after 05:00 Jul 17, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Jul 14, 2009

from Fri, Jul. 17th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Numberlink!! Jul 10, 2009

nikoli.com started to release Numberlink puzzles in the members area from Jul 10th(JST).

Result of the 63rd nikoli.com Puzzle Championship Jul 10, 2009

Congratulations to hijiring! hijiring won the 63rd puzzle championship! hijiring's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jul 24, 2009 13:00 (UTC) and the time trial problem is a Heyawake puzzle that was contributed by OLAKE.

63rd Puzzle Championship Jul 9, 2009

nikoli.com holds 63rd puzzle championships on our members page on Fri. Jul 10 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Jul 6, 2009

Miya's Hard Shikaku problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

The Nikoli Derby - 6th world championship Jul 3, 2009

Previous the Nikoli Derby that held only on the English pages, we received maximum 99 horses' entry. But for this World Championship , we accept Japanese horses from Japanese pages, so we expect more than 500 horses will be lined up at the start line.

The winners will get an original nikoli goods. Make sure you enter.

Numberlink sample problems added Jul 2, 2009

Numberlink puzzle nikoli.com now has 10 sample problems of Numberlink puzzles. The 2 added problems are "Hard". Give them a try. Can you already solve hard Numberlink problems?

nikoli.com will start to release Numberlink puzzles in the members area from Jul 10th 2009.

Added Heyawake and Masyu puzzles to The pick of the puzzles pageJul 1, 2009

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 62nd nikoli.com Puzzle Championship Jun 26, 2009

Congratulations to MOMO! MOMO won the 62nd puzzle championship! MOMO's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jul 10, 2009 13:00 (UTC) and the time trial problem is a Akari puzzle that was contributed by Miya.

Numberlink sample problems added Jun 29, 2009

nikoli.com now has 8 sample problems of Numberlink puzzles. The 3 added problems are "Medium" and "Hard". Give them a try. Can you already solve hard Numberlink problems?

nikoli.com will start to release Numberlink puzzles in the members area from July 10th 2009.

62nd Puzzle Championship Jun 25, 2009

nikoli.com holds 62nd puzzle championships on our members page on Fri. Jun 26 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

11th puzzle of nikoli.com is Numberlink Jun 19, 2009

Numberlink puzzle nikoli.com will start publishing Numberlink puzzles in our members area from July. Try out the sample puzzles of Numberlink to get to know this wonderful puzzle.

Maintenance finished Jun 19, 2009

About 30 minutes after 05:00 Jun 19, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Vote to the Puzzle survey was closed Jun 17, 2009

We will announce the results of the Puzzle survey to win a nikoli.com T-shirt! on Wed. Jun 24th.

Announcement of the maintenance work Jun 17, 2009

from Fri, Jun. 19th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 61st nikoli.com Puzzle Championship Jun 12, 2009

Congratulations to Sphinx! Sphinx won the 61st puzzle championship! Sphinx's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jun 26, 2009 13:00 (UTC) and the time trial problem is a Hashiwokakero puzzle that was contributed by 45.

61st Puzzle Championship Jun 11, 2009

nikoli.com holds 61st puzzle championships on our members page on Fri. Jun 12 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Jun 4, 2009

aspirin's Extra Hard Hitori problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Shikaku and Sudoku puzzles to The pick of the puzzles pageJun 1, 2009

Most popular Shikaku and Sudoku puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 60th nikoli.com Puzzle Championship May 29, 2009

Congratulations to Ziti! Ziti won the 60th puzzle championship! Ziti's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jun 12, 2009 13:00 (UTC) and the time trial problem is a Masyu puzzle that was contributed by Komieda.

60th Puzzle Championship May 28, 2009

nikoli.com holds 60th puzzle championships on our members page on Fri. May 29 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the 2nd Flush Game May 27, 2009

Flush is a simple and easy game. You just guess and write down the phrases that the most people will imagine.

Look here for the results of the 2nd Flush Game.

Author interviews Vol.8May 21, 2009

Yuichi Saito: male, twenty eight years old (in 2007), working in a company as an engineer - making things, a doctor of engineering. His hobbies other than puzzles are traveling abroad and skiing.

Entry to The Flush was closed May 20, 2009

We will announce the ranking of all participants of The Flush on Wed. May 27th.

Win a nikoli.com T-shirt! Vote in our puzzle surveyMay 18, 2009

We started questionnaire survey intended for our members.

nikoli.com publishes 120 new puzzles every month. From July 10th we will add the Numberlink puzzle to the line-up so there will be 11 different kinds of puzzles available. The monthly total will not change however and we would like to hear from you how many of each of our puzzles you would like us to make available. To help us find out please complete the survey.

Maintenance finished May 15, 2009

About 10 minutes after 05:00 May 15, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Result of the 59th nikoli.com Puzzle Championship May 15, 2009

Congratulations to MOR! MOR won the 59th puzzle championship! MOR's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. May 29, 2009 13:00 (UTC) and the time trial problem is a Kakuro puzzle that was contributed by -4.

59th Puzzle Championship May 14, 2009

nikoli.com holds 59th puzzle championships on our members page on Fri. May 15 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Entry to the "Flush" game will soon be closed May 11, 2009

This is a simple and easy game. You just guess and write down the phrases that the most people will imagine. Please remember that what pops into your head maybe occurs to no body else.

Deadline: Tue. May 19, 15:00(UTC)

Announcement of the maintenance work May 11, 2009

from Fri, May. 15th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Nurikabe puzzles to The pick of the puzzles pageMay 6, 2009

Most popular Nurikabe puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

A Zen Day May 2, 2009

We are declaring the coming May 10th as "A Zen Day." In Japanese "A Zen" means to do things Extra Hard. Please stay cool though, here we will release four extra hard puzzles at the members area.

  • 00:00(JST): A giant size Hashiwokakero and a 36x20 Masyu
  • 12:00(JST): A 36x20 Akari and a 36x20 Nurikabe

You will sit in front of your screen like an ascetic Zen monk. May 10th may be your longest day ever!

Added Botsu Bako problem May 1, 2009

juno's Extra Hard Nurikabe problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 58th nikoli.com Puzzle Championship May 1, 2009

Congratulations to hiraku! hiraku won the 58th puzzle championship! hiraku's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. May 15, 2009 13:00 (UTC) and the time trial problem is a Hitori puzzle that was contributed by 45.

58th Puzzle Championship Apr 30, 2009

nikoli.com holds 58th puzzle championships on our members page on Fri. May 1 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 57th nikoli.com Puzzle Championship Apr 17, 2009

Congratulations to oma! oma won the 57th puzzle championship! oma's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. May 1, 2009 13:00 (UTC) and the time trial problem is a Shikaku puzzle that was contributed by aiko.

Additional function for members to evaluate puzzles Apr 17, 2009

We have added a new function where you can assign an evaluation (rank) for each of your puzzles. You evaluate and assign ranks according to your own standards. You can input the rank you select on the "solution status" page.

You are also able to rearrange your puzzles on the "problem list" based on your ranking.

Maintenance finished Apr 17, 2009

About 10 minutes after 05:00 Apr 17, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

57th Puzzle Championship Apr 16, 2009

nikoli.com holds 57th puzzle championships on our members page on Fri. Apr 17 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Second round of "Flush" - the word game Apr 15, 2009

This is a simple and easy game. You just guess and write down the phrases that the most people will imagine. Please remember that what pops into your head maybe occurs to no body else. The winner will receive an original Nikoli T-shirt.

Announcement of the maintenance work Apr 13, 2009

from Fri, Apr. 17th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Apr 6, 2009

osakana's Extra Hard Slitherlink problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 56th nikoli.com Puzzle Championship Apr 3, 2009

Congratulations to Hammy! Hammy won the 56th puzzle championship! Hammy's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Apr 17, 2009 13:00 (UTC) and the time trial problem is a Sudoku puzzle that was contributed by Casty.

56th Puzzle Championship Apr 2, 2009

nikoli.com holds 56th puzzle championships on our members page on Fri. Apr 3 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Color reductions due to business deterioration Apr 1, 2009

The unprecedented recession is still reverberating around the world after the Lehman shock. Almost all companies are planning drastic cuts in expenses, and our website nikoli.com will also have to run on a tighter budget. As a start, we have decided to reduce the number of colors of the website. We have started by removing the brighter parts of the spectrum and you now have wretched, bland, and dull Nikoli pages on your display. This has been a painful decision made necessary to continue the site. We hope you appreciate our situation and agree with the decision.

Maki Kaji, Father of Sudoku and President of Nikoli Co., Ltd.

P.S. While the reductions in color are in force I will ask you to imagine the missing colors, by using your imagination - like you do when you solve our puzzles. I hope that with the help of your imagination you will see the colors that are not there. When you see colors like the usual on nikoli.com, you have experienced another positive effect of doing Nikoli puzzles.

MK

Added Slitherlink puzzles to The pick of the puzzles pageApr 1, 2009

Most popular Slitherlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 55th nikoli.com Puzzle Championship Mar 20, 2009

Congratulations to uri! uri won the 55th puzzle championship! uri's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Apr 3, 2009 13:00 (UTC) and the time trial problem is a Nurikabe puzzle that was contributed by Casty.

55th Puzzle Championship Mar 19, 2009

nikoli.com holds 55th puzzle championships on our members page on Fri. Mar 20 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Fixed Try-mode of Hashiwokakero puzzles Mar 16, 2009

From now on, you will able to draw a second bridge when there is one bridge already.

Please clear the browser cache, if the Try-mode doesn't work correctly.

Results of the Nikoli Derby - 5th world championship Mar 11, 2009

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 5th world championship.

Added Botsu Bako problem Mar 9, 2009

Yuichi Saito's Extra Hard Heyawake problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Result of the 54th nikoli.com Puzzle Championship Mar 6, 2009

Congratulations to moku! moku won the 54th puzzle championship! moku's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Mar 20, 2009 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by aiko.

54th Puzzle Championship Mar 5, 2009

nikoli.com holds 54th puzzle championships on our members page on Fri. Mar 6 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Entry to The Nikoli Derby was closed Mar 4, 2009

We will announce the ranking of all participants of The Nikoli Derby on Wed. Mar 11th.

Added Hitori and Kakuro puzzles to The pick of the puzzles pageMar 3, 2009

Most popular Hitori and Kakuro puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Entry to The Nikoli Derby will soon be closed Feb 27, 2009

The winners will get a nikoli.com original T-shirt or a nikoli puzzle book. Make sure you enter. Deadline Tue. Mar 3, 15:00(UTC)

Result of the 53rd nikoli.com Puzzle Championship Feb 20, 2009

Congratulations to komami-! komami- won the 53rd puzzle championship! komami-'s name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Mar 6, 2009 13:00 (UTC) and the time trial problem is a Heyawake puzzle that was contributed by Komieda.

Maintenance finished Feb 20, 2009

About 15 minutes after 05:00 Feb 20, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

53rd Puzzle Championship Feb 19, 2009

nikoli.com holds 53rd puzzle championships on our members page on Fri. Feb 20 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Sorry for the access failureFeb 18, 2009

We aresorry. Because of the server trouble, you could not able to get access to the nikoli.com everybody's pages from 09:20 to 10:30(UTC).

Author interviews Vol.7Feb 17, 2009

"-4" is a technical expert, designing things, working for a well known manufacturer. In the world of puzzles, he goes by the name "Yon-sama"(like the Korean TV actor). He is lively, polite, twenty nine years old, and single.

Announcement of the maintenance work Feb 16, 2009

from Fri, Jan. 20th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 52nd nikoli.com Puzzle Championship Feb 6, 2009

Congratulations to nyoroppyi! nyoroppyi won the 52nd puzzle championship! nyoroppyi's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Feb 20, 2009 13:00 (UTC) and the time trial problem is a Akari puzzle that was contributed by aiko.

52nd Puzzle Championship Feb 5, 2009

nikoli.com holds 52nd puzzle championships on our members page on Fri. Feb 6 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Feb 4, 2009

Stukid's Extra Hard Masyu problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Akari and Hashiwokakero puzzles to The pick of the puzzles pageFeb 2, 2009

Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

The Nikoli Derby - 5th world championship Jan 30, 2009

Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Result of the 51st nikoli.com Puzzle Championship Jan 23, 2009

Congratulations to Kitakaze! Kitakaze won the 51st puzzle championship! Kitakaze's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Feb 6, 2009 13:00 (UTC) and the time trial problem is a Hashiwokakero puzzle that was contributed by 45.

51st Puzzle Championship Jan 22, 2009

nikoli.com holds 51st puzzle championships on our members page on Fri. Jan 23 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the 3rd Minority Decides Game Jan 21, 2009

The Minority Decides is a nikoli original easygoing party game.

Look here for the results of the 3rd Minority Decides Game.

Maintenance finished Jan 16, 2009

About 10 minutes after 05:00 Jan 16, 2009(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Entry to The 3rd Minority Decides was closed Jan 14, 2009

We will announce the result of The Minority Decides on Wed. Jan 21st.

Announcement of the maintenance work Jan 13, 2009

from Fri, Jan. 16th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 50th nikoli.com Puzzle Championship Jan 9, 2009

Congratulations to H.Jo! H.Jo won the 50th puzzle championship! H.Jo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Jan 23, 2009 13:00 (UTC) and the time trial problem is a Masyu puzzle that was contributed by akasyo.

50th Puzzle Championship Jan 8, 2009

nikoli.com holds 50th puzzle championships on our members page on Fri. Jan 9 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Jan 6, 2009

45's Extra Hard Hashiwokakero problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Heyawake and Masyu puzzles to The pick of the puzzles pageJan 4, 2009

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 49th nikoli.com Puzzle Championship Dec 27, 2008

The winners of the puzzle championship vol. 49 are volxa (Nurikabe), polake (Heyawake) and nyoroppyi (Shikaku), ! Congratulations! Their names are now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be Fri. Jan 9, 13:00 (UTC). The puzzle will be a 31x21 Extra Hard Kakuro created by akasyo.

The 3rd Minority Decides Game Dec 9, 2008

This is a nikoli original easygoing party game. To take part you choose "yes" or "no" for the questions at the entry page. The winner will receive an original Nikoli T-shirt.

Added Botsu Bako problem Dec 3, 2008

Kumotan's Extra Hard Slitherlink problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

The next Puzzle Championship will be Sat. Dec 27, 04:00(UTC) Dec 22, 2008

nikoli.com holds 49th Puzzle Championship on our members page on Sat. Dec 27, 04:00 (UTC). We will set 3 kind of problems at the same time. The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Dec 19, 2008

About 10 minutes after 05:00 Dec 19, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Dec 16, 2008

from Fri, Dec. 19th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 48th nikoli.com Puzzle Championship Dec 12, 2008

Congratulations to motris! motris won the 48th puzzle championship! motris's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be Sat. Dec 27, 04:00 (UTC). We will set 3 kind of problems at the same time.

48th Puzzle Championship Dec 11, 2008

nikoli.com holds 48th puzzle championships on our members page on Fri. Dec 12 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Shikaku and Sudoku puzzles to The pick of the puzzles pageDec 1, 2008

Most popular Shikaku and Sudoku puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 47th nikoli.com Puzzle Championship Nov 28, 2008

Congratulations to hijiring! hijiring won the 47th puzzle championship! hijiring's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Dec 12, 2008 13:00 (UTC) and the time trial problem is a Sudoku puzzle that was contributed by red-magician.

nikoli.com original XXL T-shirtNov 27, 2008

nikoli.com original XXL T-shirt Japanese XL size T-shirt is maybe small for the overseas members. So, nikoli.com had prepared XXL size T-shirt as one of the prizes in the nikoli.com events. You will be able to get a T-shirt, if you won the Puzzle Championship, Nikoli Derby and other events.

47th Puzzle Championship Nov 27, 2008

nikoli.com holds 47th puzzle championships on our members page on Fri. Nov 28 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Nov 21, 2008

About 25 minutes after 05:00 Nov 21, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Nov 19, 2008

from Fri, Nov. 21st 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 46th nikoli.com Puzzle Championship Nov 14, 2008

Congratulations to aji! aji won the 46th puzzle championship! aji's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Nov 28, 2008 13:00 (UTC) and the time trial problem is a Akari puzzle that was contributed by Casty.

46th Puzzle Championship Nov 13, 2008

nikoli.com holds 46th puzzle championships on our members page on Fri. Nov 14 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Nurikabe puzzles to The pick of the puzzles pageNov 4, 2008

Most popular Nurikabe puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 45th nikoli.com Puzzle Championship Oct 31, 2008

Congratulations to MOR! MOR won the 45th puzzle championship! MOR's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Nov 14, 2008 13:00 (UTC) and the time trial problem is a Hashiwokakero puzzle that was contributed by 45.

45th Puzzle Championship Oct 30, 2008

nikoli.com holds 45th puzzle championships on our members page on Fri. Oct 31 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Oct 20, 2008

osakana's Hard Nurikabe problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Oct 17, 2008

From 05:00 to 06:50 Oct 17, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Result of the 44th nikoli.com Puzzle Championship Oct 17, 2008

Congratulations to aji! aji won the 44th puzzle championship! aji's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Oct 31, 2008 13:00 (UTC) and the time trial problem is a Hitori puzzle that was contributed by Kumotan.

44th Puzzle Championship Oct 16, 2008

nikoli.com holds 44th puzzle championships on our members page on Fri. Oct 17 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the 1st Flush Game Oct 14, 2008

Flush is a simple and easy game. You just guess and write down the phrases that the most people will imagine.

Look here for the results of the 1st Flush Game.

Announcement of the maintenance work Oct 14, 2008

from Fri, Sep. 17th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Entry to The Flush was closed Oct 8, 2008

We will announce the ranking of all participants of The Flush on Wed. Oct 15th.

Entry to The Flush will soon be closed Oct 4, 2008

The winners will get a nikoli.com original T-shirt or a nikoli puzzle book. Make sure you enter. Deadline Tue. Oct 7, 15:00(UTC)

Result of the 43rd nikoli.com Puzzle Championship Oct 3, 2008

Congratulations to volxa! volxa won the 43rd puzzle championship! volxa's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Oct 17, 2008 13:00 (UTC) and the time trial problem is a Masyu puzzle that was contributed by Casty.

Added Slitherlink puzzles to The pick of the puzzles pageOct 2, 2008

Most popular Slitherlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

43rd Puzzle Championship Oct 2, 2008

nikoli.com holds 43rd puzzle championships on our members page on Fri. Oct 3 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 42nd nikoli.com Puzzle Championship Sep 19, 2008

Congratulations to jyokun! jyokun won the 42nd puzzle championship! jyokun's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Oct 3, 2008 13:00 (UTC) and the time trial problem is a Kakuro puzzle that was contributed by akasyo.

Maintenance finished Sep 19, 2008

About 25 minutes after 05:00 Sep 19, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Puzzle Championship Sep 18, 2008

nikoli.com holds puzzle championships on our members page on Fri. Sep 19 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Sep 16, 2008

from Fri, Sep. 19th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Added Botsu Bako problem Sep 15, 2008

mimic's Extra Hard Masyu problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Jigsaw puzzle in Summer Sep 11, 2008

Jigsaw Puzzle Added animated jigsaw puzzle you can play for free in your browser.

Hashiwokakero!! Sep 10, 2008

Hashiwokakero puzzle nikoli.com started to release Hashiwokakero puzzles in the members area from Sep 10th(JST).

Fixed bug in the Flush game page Sep 10, 2008

Sorry, we had a bug in the entry page of the Flush game. We fixed it at Sep.10, 01:00(UTC).

If you had already entered your words before this time and you were not able to submit your words smoothly, please enter again.

10th puzzle of nikoli.com is Hashiwokakero Sep 9, 2008

The first problem of Hashiwokakero puzzle will be released at Sep 9, 15:00(UTC).

Result of the 41st nikoli.com Puzzle Championship Sep 5, 2008

Congratulations to sirousa! sirousa won the 41st puzzle championship! sirousa's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 19, 2008 13:00 (UTC) and the time trial problem is a Nurikabe puzzle that was contributed by juno.

41st Puzzle Championship Sep 5, 2008

nikoli.com holds 41st puzzle championships on our members page on Fri. Sep 5 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

First round of "Flush" - the word game Sep 4, 2008

This is a simple and easy game. You just guess and write down the phrases that the most people will imagine. Please remember that what pops into your head maybe occurs to no body else. The winner will receive an original Nikoli T-shirt.

Hashiwokakero sample problems added Sep 3, 2008

nikoli.com now has 10 sample problems of Hashiwokakero puzzles. The 2 added problems are "Hard". Give them a try. Can you already solve hard Hashiwokakero problems?

nikoli.com will start to release Hashiwokakero puzzles in the members area from Sep 10th 2008.

In the Try-mode you can't draw a second bridge when there is one bridge already.

Hashiwokakero sample problems added Sep 3, 2008

nikoli.com now has 10 sample problems of Hashiwokakero puzzles. The 2 added problems are "Hard". Give them a try. Can you already solve hard Hashiwokakero problems?

nikoli.com will start to release Hashiwokakero puzzles in the members area from Sep 10th 2008.

In the Try-mode you can't draw a second bridge when there is one bridge already.

Added Hitori and Kakuro puzzles to The pick of the puzzles pageSep 1, 2008

Most popular Hitori and Kakuro puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Hashiwokakero sample problems added Aug 30, 2008

nikoli.com now has 8 sample problems of Hashiwokakero puzzles. The 3 added problems are "Medium" and "Hard". Give them a try. Can you already solve hard Hashiwokakero problems?

nikoli.com will start to release Hashiwokakero puzzles in the members area from Sep 10th 2008.

10th puzzle of nikoli.com is Hashiwokakero Aug 27, 2008

Hashiwokakero puzzle nikoli.com will start publishing Hashiwokakero puzzles in our members area from Sep. Try out the sample puzzles of Hashiwokakero to get to know this wonderful puzzle.

Result of the 40th nikoli.com Puzzle Championship Aug 22, 2008

Congratulations to MOR! MOR won the 40th puzzle championship! MOR's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Sep 5, 2008 13:00 (UTC) and the time trial problem is a Shikaku puzzle that was contributed by Casty.

40th Puzzle Championship Aug 21, 2008

nikoli.com holds 40th puzzle championships on our members page on Fri. Aug 22 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Aug 19, 2008

aspirin's Extra Hard Hitori problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Aug 15, 2008

About 15 minutes after 05:00 Aug 15, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Vote to the Puzzle survey was closed Aug 13, 2008

We will announce the results of the Puzzle survey to win a nikoli.com T-shirt! on Tue. Aug 19th.

Author interviews Vol.6Aug 11, 2008

SAKAMOTO Nobuyuki is a puzzle author without a nickname, using his real name. He is 30 years old, single. He also creates Japanese word puzzles so he is what we call an all-round author.

Announcement of the maintenance work Aug 11, 2008

from Fri, Aug. 15th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 39th nikoli.com Puzzle Championship Aug 8, 2008

Congratulations to volxa! volxa won the 39th puzzle championship! volxa's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Aug 22, 2008 13:00 (UTC) and the time trial problem is a Akari puzzle that was contributed by juno.

39th Puzzle Championship Aug 8, 2008

nikoli.com holds 39th puzzle championships on our members page on Fri. Aug 8 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Akari puzzles to The pick of the puzzles pageAug 7, 2008

Most popular Akari puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 38th nikoli.com Puzzle Championship Jul 23, 2008

Congratulations to jyokun! jyokun won the 38th puzzle championship! jyokun's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Fri. Aug 8, 2008 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by crimson.

38th Puzzle Championship - Wed. Jul 23 at 13:00(UTC) Jul 21, 2008

nikoli.com holds 38th puzzle championships on our members page on Wed. Jul 23 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Jul 18, 2008

About 70 minutes after 05:00 Jul 18, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Added Botsu Bako problem Jul 15, 2008

juno's Extra Hard Akari problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Announcement of the maintenance work Jul 14, 2008

from Fri, Jul. 18th 05:00(UTC), about 3 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 37th nikoli.com Puzzle Championship Jul 13, 2008

Congratulations to lozz! lozz won the 37th puzzle championship! lozz's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Wed. Jul 23, 2008 13:00 (UTC) and the time trial problem is a Heyawake puzzle that was contributed by Casty.

37th Puzzle Championship Jul 12, 2008

nikoli.com holds 37th puzzle championships on our members page on Sun. Jul 13 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 36th nikoli.com Puzzle Championship Jul 4, 2008

Congratulations to Ziti! Ziti won the 36th puzzle championship! Ziti's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sun. Jul 13, 2008 13:00 (UTC) and the time trial problem is a Masyu puzzle that was contributed by NyanBaz.

36th Puzzle Championship Jul 4, 2008

nikoli.com holds 36th puzzle championships on our members page on Fri. Jul 4 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Heyawake and Masyu puzzles to The pick of the puzzles pageJul 2, 2008

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Win a nikoli.com T-shirt! Vote in our puzzle surveyJun 25, 2008

We started questionnaire survey intended for our members.

nikoli.com publishes 120 new puzzles every month. From this fall we will add the Hashiwokakero puzzle to the line-up so there will be 10 different kinds of puzzles available. The monthly total will not change however and we would like to hear from you how many of each of our puzzles you would like us to make available. To help us find out please complete the survey.

Author interviews Vol.5Jun 23, 2008

OX has over ten years of experience as a puzzle author, and he is still just a young 25 year old. Now he is also studying in law school to pass the National Bar Examination, he is single and lives alone. His favorite cooking is sauteed dishes he told us.

Result of the 35th nikoli.com Puzzle Championship Jun 20, 2008

Congratulations to detuned! detuned won the 35th puzzle championship! detuned's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Jul 4, 2008 13:00 (UTC) and the time trial problem is a Kakuro puzzle that was contributed by akasyo.

35th Puzzle Championship Jun 19, 2008

nikoli.com holds 35th puzzle championships on our members page on Fri. Jun 20 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

One Layout Slitherlinks Jun 13, 2008

Slitherlink puzzles often show the authors' personalities in the layout of the hints. Then at Nikoli we thought that if we specify the layout, what differences in the flavor will the authors bring to the puzzles? And yes, we really tried it. We asked many authors to make a Slitherlink puzzle based on the same layout, and here we have 19 (nineteen!) of these puzzles.

Maintenance finished Jun 13, 2008

About 25 minutes after 05:00 Jun 13, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Added Botsu Bako problem Jun 10, 2008

osakana's Extra Hard Nurikabe problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Announcement of the maintenance work Jun 10, 2008

from Fri, Jun. 13th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 34th nikoli.com Puzzle Championship Jun 6, 2008

Congratulations to gorish! gorish won the 34th puzzle championship! gorish's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Jun 20, 2008 13:00 (UTC) and the time trial problem is a Sudoku puzzle that was contributed by Hone Rokuo.

34th Puzzle Championship Jun 5, 2008

nikoli.com holds 34th puzzle championships on our members page on Fri. Jun 6 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Shikaku and Sudoku puzzles to The pick of the puzzles pageJun 2, 2008

Most popular Shikaku and Sudoku puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 33rd nikoli.com Puzzle Championship May 23, 2008

Congratulations to Malthus! Malthus won the 33rd puzzle championship! Malthus's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Jun 6, 2008 13:00 (UTC) and the time trial problem is a Nurikabe puzzle that was contributed by MINE.

33rd Puzzle Championship May 22, 2008

nikoli.com holds 33rd puzzle championships on our members page on Fri. May 23 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Entry to The Nikoli Derby was closed May 21, 2008

We will announce the ranking of all participants of The Nikoli Derby on Tue. May 27th.

Entry deadline of the Nikoli Derby is Tue. May 20, 15:00(UTC)May 16, 2008

Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Maintenance finished May 16, 2008

About 20 minutes after 05:00 May 16, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work May 14, 2008

from Fri, May. 16th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 32nd nikoli.com Puzzle Championship May 9, 2008

Congratulations to H.Jo! H.Jo won the 32nd puzzle championship! H.Jo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from May 23, 2008 13:00 (UTC) and the time trial problem is a Shikaku puzzle that was contributed by aspirin.

32nd Puzzle Championship May 9, 2008

nikoli.com holds 32nd puzzle championships on our members page on Fri. May 9 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem May 8, 2008

crimson's Medium Slitherlink problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Nurikabe puzzles to The pick of the puzzles pageMay 1, 2008

Most popular Nurikabe puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 31st nikoli.com Puzzle Championship Apr 25, 2008

Congratulations to aji! aji won the 31st puzzle championship! aji's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from May 9, 2008 13:00 (UTC) and the time trial problem is a Hitori puzzle that was contributed by OLAKE.

31st Puzzle Championship Apr 25, 2008

nikoli.com holds 31st puzzle championships on our members page on Fri. Apr 25 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Apr 23, 2008

We are going to publish interviews with puzzle authors, about how they make puzzles.

The Nikoli Derby - 4th world championship Apr 18, 2008

The Nikoli Derby was developed by nikoli as a party game. It has very simple rules that make it exciting and easy for all, from kids to much older players.

For this World Championship we accept Japanese horses from the Japanese pages. We estimate there will be more than 500 horses starting.

Maintenance finished Apr 18, 2008

About 15 minutes after 05:00 Apr 18, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Jigsaw puzzle in Spring Apr 14, 2008

Jigsaw Puzzle Added animated jigsaw puzzle you can play for free in your browser.

Announcement of the maintenance work Apr 14, 2008

from Fri, Apr. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 30th nikoli.com Puzzle Championship Apr 11, 2008

Congratulations to H.Jo! H.Jo won the 30th puzzle championship! H.Jo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Apr 25, 2008 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by Komieda.

30th Puzzle Championship Apr 10, 2008

nikoli.com holds 30th puzzle championships on our members page on Fri. Apr 11 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Apr 4, 2008

Tea.M's extra hard Sudoku problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

2008's April Fools' page Apr 2, 2008

2008's April Fools' page can be seen here. We had prepared seven Casty and fabulous puzzles for you.

Added Slitherlink puzzles to The pick of the puzzles pageApr 2, 2008

Most popular Slitherlink puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 29th nikoli.com Puzzle Championship Mar 28, 2008

Congratulations to moku! moku won the 29th puzzle championship! moku's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Apr 11, 2008 13:00 (UTC) and the time trial problem is a Akari puzzle that was contributed by akasyo.

29th Puzzle Championship Mar 28, 2008

nikoli.com holds 29th puzzle championships on our members page on Fri. Mar 28 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the Nikoli Derby - 4th world championship Mar 27, 2008

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 4th world championship.

Maintenance finished Mar 21, 2008

About 30 minutes after 05:00 Mar 21, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Mar 17, 2008

from Fri, Mar. 21st 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 28th nikoli.com Puzzle Championship Mar 14, 2008

Congratulations to Kitakaze! Kitakaze won the 28th puzzle championship! Kitakaze's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Mar 28, 2008 13:00 (UTC) and the time trial problem is a Heyawake puzzle that was contributed by NyanBaz.

28th Puzzle Championship Mar 14, 2008

nikoli.com holds 28th puzzle championships on our members page on Fri. Mar 14 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the Nikoli Derby - 3rd world championship Mar 11, 2008

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 3rd world championship.

Added Botsu Bako problem Mar 7, 2008

juno's extra hard Masyu problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Entry to The Nikoli Derby was closed Mar 5, 2008

We will announce the ranking of all participants of The Nikoli Derby on Tue. Mar 11th.

Added Hitori and Kakuro puzzles to The pick of the puzzles pageMar 4, 2008

Most popular Hitori and Kakuro puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 27th nikoli.com Puzzle Championship Feb 29, 2008

Congratulations to H.Jo! H.Jo won the 27th puzzle championship! H.Jo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Mar 14, 2008 13:00 (UTC) and the time trial problem is a Masyu puzzle that was contributed by Miya.

27th Puzzle Championship Feb 29, 2008

nikoli.com holds 27th puzzle championships on our members page on Fri. Feb 29 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Entry deadline of the Nikoli Derby is Mon. Mar 4, 15:00(UTC)Feb 28, 2008

Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt or the latest volume of "Puzzle Communication Nikoli".

Jigsaw puzzle in Winter Feb 21, 2008

Jigsaw Puzzle Added animated jigsaw puzzle you can play for free in your browser.

Result of the 26th nikoli.com Puzzle Championship Feb 15, 2008

Congratulations to Hammy! Hammy won the 26th puzzle championship! Hammy's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Feb 29, 2008 13:00 (UTC) and the time trial problem is a Kakuro puzzle that was contributed by osakana.

26th Puzzle Championship Feb 15, 2008

nikoli.com holds 26th puzzle championships on our members page on Fri. Feb 15 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Feb 15, 2008

About 35 minutes after 05:00 Feb 15, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Author interviews Vol.4 - aspirin Feb 12, 2008

The interview with aspirin is open to members.

He talked "I'll keep making puzzles. I want to look after the people who enjoy doing aspirin's puzzles. I hope we will be together for a long time.".

Announcement of the maintenance work Feb 12, 2008

from Fri, Feb. 15th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

The Nikoli Derby - 3rd world championship Feb 5, 2008

The Nikoli Derby was developed by nikoli as a party game. It has very simple rules that make it exciting and easy for all, from kids to much older players.

Let's register from "The 3rd Nikoli Derby World Championship" page!!

Added Botsu Bako problem Feb 4, 2007

Stukid's extra hard Heyawake problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Akari puzzles to The pick of the puzzles pageFeb 1, 2008

Most popular Akari puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 25th nikoli.com Puzzle Championship Feb 1, 2008

Congratulations to H.Jo! H.Jo won the 25th puzzle championship! H.Jo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Feb 15, 2008 13:00 (UTC) and the time trial problem is a Nurikabe puzzle that was contributed by red-magician.

Result of the 24th nikoli.com Puzzle Championship Jan 18, 2008

Congratulations to uri! uri won the 24th puzzle championship! uri's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Feb 1, 2008 13:00 (UTC) and the time trial problem is a Shikaku puzzle that was contributed by Casty.

Maintenance finished Jan 18, 2008

About 15 minutes after 05:00 Jan 18, 2008(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

24th Puzzle Championship Jan 17, 2008

nikoli.com holds 24th puzzle championships on our members page on Fri. Jan 18 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Results of the 2nd Minority Decides Game Jan 15, 2008

The Minority Decides is a nikoli original easygoing party game.

Look here for the results of the 2nd Minority Decides Game.

Announcement of the maintenance work Jan 15, 2008

from Fri, Jan. 18th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Masyu!! Jan 10, 2008

Masyu puzzle nikoli.com started to release Masyu puzzles in the members area from Jan 10th(JST).

Masyu problems Jan 8, 2008

Masyunikoli.com will start to release Masyu puzzles in the members area from Jan 10th(JST).

The first problem of Masyu puzzle will be released at Jan 9, 15:00(UTC).

Entry to The Minority Decides Vol.2 was closed Jan 7, 2008

We will announce the result of The Minority Decides on Tue. Jan 15th.

Result of the 23rd nikoli.com Puzzle Championship Jan 4, 2008

Congratulations to komami-! komami- won the 23rd puzzle championship! komami-'s name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Jan 18, 2008 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by Yuichi Saito.

23rd Puzzle Championship Jan 3, 2008

nikoli.com holds 23rd puzzle championships on our members page on Fri. Jan 4 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Heyawake puzzles to The pick of the puzzles pageJan 1, 2008

Most popular Heyawake puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Added Botsu Bako problem Dec 28, 2007

mimic's extra hard Shikaku problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Masyu sample problems added Dec 27, 2007

nikoli.com now has 10 sample problems of Masyu puzzles. The 2 added problems are "Hard". Give them a try. Can you already solve hard Masyu problems?

nikoli.com will start to release Masyu puzzles in the members area from Jan 10th 2008.

Self-introduction pages Dec 21, 2007

Please try to enter your self-introduction page in the members area. Your self-introduction will be open to the nikoli.com members.

Result of the 22nd nikoli.com Puzzle Championship Dec 21, 2007

Congratulations to Kazunegi! Kazunegi won the 22nd puzzle championship! Kazunegi's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Jan 4, 2008 13:00 (UTC) and the time trial problem is a Akari puzzle that was contributed by crimson.

Masyu sample problems added Dec 21, 2007

nikoli.com now has 8 sample problems of Masyu puzzles. The 3 added problems are "Medium" and "Hard". Give them a try. Can you already solve hard Masyu problems?

nikoli.com will start to release Masyu puzzles in the members area from Jan 10th 2008.

Maintenance finished Dec 21, 2007

About 25 minutes after 05:00 Dec 21, 2007(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Dec 18, 2007

from Fri, Dec. 21st 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

22nd Puzzle Championship Dec 20, 2007

nikoli.com holds 22nd puzzle championships on our members page on Fri. Dec 21 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

9th puzzle of nikoli.com is Masyu Dec 14, 2007

Masyu puzzle nikoli.com will start publishing Masyu puzzles in our members area from Jan. Try out the sample puzzles of Masyu to get to know this wonderful puzzle.

Result of the 21st nikoli.com Puzzle Championship Dec 7, 2007

Congratulations to tarotaro! tarotaro won the 21st puzzle championship! tarotaro's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Dec 21, 13:00 (UTC) and the time trial problem is a Heyawake puzzle that was contributed by aspirin.

21st Puzzle Championship Dec 7, 2007

nikoli.com holds 21st puzzle championships on our members page on Fri. Dec 7 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Shikaku and Sudoku puzzles to The pick of the puzzles pageDec 3, 2007

Most popular Shikaku and Sudoku puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

The Minority Decides Vol.2 Nov 28, 2007

This is a nikoli original easygoing party game. To take part you choose "yes" or "no" for the questions at the entry page. The winner will receive an original Nikoli T-shirt.

Result of the 20th nikoli.com Puzzle Championship Nov 23, 2007

The recent nikoli.com Puzzle Championship was from Nov 23, 13:00 Fri. (UTC). Hammy(Nurikabe), aji(Sihkaku) and Hugo(Kakuro) won the puzzle championship vol.20. Congratulations!!

The next puzzle championship will be held from Nov 23, 13:00(UTC). We will set 3 kind of problems at the same time. red-magician's Nurikabe, mimic's Hitori and Komieda's Kakuro are waiting for your challenge.

20th Puzzle Championship Nov 23, 2007

nikoli.com holds 20th puzzle championships on our members page on Fri. Nov 23 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Nov 19, 2007

Z_H's extra hard Hitori problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Maintenance finished Nov 16, 2007

About 50 minutes after 05:00 Dec 16, 2007(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Nov 12, 2007

from Fri, Nov. 16th 05:00(UTC), about 2 hours

You will not able to get access to the members page of the nikoli.com during this time. Sorry for the inconvenience.

Result of the 19th nikoli.com Puzzle Championship Nov 9, 2007

Congratulations to jyokun! jyokun won the 19th puzzle championship! jyokun's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Nov 23, 13:00 (UTC). We will set 3 kind of problems at the same time. red-magician's Nurikabe, mimic's Hitori and Komieda's Kakuro are waiting for your challenge.

19th Puzzle Championship Nov 8, 2007

nikoli.com holds 19th puzzle championships on our members page on Fri. Nov 9 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Nurikabe puzzles to The pick of the puzzles pageNov 1, 2007

3 most popular Nurikabe puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 18th nikoli.com Puzzle Championship Oct 26, 2007

Congratulations to maysure! maysure won the 18th puzzle championship! maysure's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Nov 9, 13:00 (UTC) and the time trial problem is a Hitori puzzle that was contributed by mimic.

18th Puzzle Championship Oct 26, 2007

nikoli.com holds 18th puzzle championships on our members page on Fri. Oct 26 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Added Botsu Bako problem Oct 17, 2007

Momotereu's unique Kakuro problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Jigsaw Puzzle Oct 16, 2007

Jigsaw Puzzle Added animated jigsaw puzzle you can play for free in your browser.

Result of the 17th nikoli.com Puzzle Championship Oct 12, 2007

Congratulations to uri! uri won the 17th puzzle championship! uri's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Oct 26, 13:00 (UTC) and the time trial problem is a Nurikabe puzzle that was contributed by aspirin.

17th Puzzle Championship Oct 12, 2007

nikoli.com holds 17th puzzle championships on our members page on Fri. Oct 12 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Author interviews Oct 5, 2007

We are going to publish interviews with puzzle authors in the members only area, about how they make puzzles.

Maintenance finished Oct 5, 2007

About 20 minutes after 05:00 Oct 5, 2007(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Results of the Nikoli Derby - 2nd world championship Oct 3, 2007

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 2nd world championship.

Added Slitherlink puzzles to The pick of the puzzles pageOct 3, 2007

3 most popular Slitherlink puzzles is opened to our members. Let's play in The pick of the puzzles page in the members area.

Announcement of the maintenance work Sep 30, 2007

from Fri, Oct. 5th 05:00(UTC), about 2 hours

You will not able to get access to the members page of the nikoli.com during this time. Sorry for the inconvenience.

Result of the 16th nikoli.com Puzzle Championship Sep 28, 2007

Congratulations to maysure! maysure won the 16th puzzle championship! maysure's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Oct 12, 13:00 (UTC) and the time trial problem is a Kakuro puzzle that was contributed by crimson.

16th Puzzle Championship Sep 28, 2007

nikoli.com holds 16th puzzle championships on our members page on Fri. Sep 28 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Take a break puzzles Sep 27, 2007

Unwind puzzles - puzzles that are easy to do. Do you know how many colors you need when you paint the countries in a world map, and neighboring countries must use a different color? The answer is that you only need four.

Entry to The Nikoli Derby was closed Sep 26, 2007

We will announce the ranking of all participants of The Nikoli Derby on Wed. Oct 3rd.

Added Botsu Bako problem Sep 21, 2007

mimic's extra hard Slitherlink problem is opened to our members. Let's play in the Botsu Bako (Extra Special Problems) page in the members area.

Entry to The Nikoli Derby will soon be closed Sep 20, 2007

The winners will get a nikoli.com original T-shirt or a nikoli puzzle book. Make sure you enter. Deadline Tue. Sep 25, 15:00(UTC)

Result of the 15th nikoli.com Puzzle Championship Sep 14, 2007

Congratulations to maysure! maysure won the 15th puzzle championship! maysure's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sep 28, 13:00 (UTC) and the time trial problem is a Slitherlink puzzle that was contributed by OX.

The pick of the puzzles Sep 13, 2007

We have now thought of a way to keep the most popular puzzles in the pick of the puzzles page at the Members only area. Please vote for the greatest puzzle according to you.

15th Puzzle Championship Sep 13, 2007

nikoli.com holds 15th puzzle championships on our members page on Fri. Sep 14 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Maintenance finished Sep 7, 2007

About 25 minutes after 05:00 Sep 7, 2007(UTC).

Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.

Results of the 1st Minority Decides Game Sep 4, 2007

The Minority Decides is a nikoli original easygoing party game.

Look here for the results of the 1st Minority Decides Game.

Result of the 14th nikoli.com Puzzle Championship Aug 31, 2007

Congratulations to maysure! maysure won the 14th puzzle championship! maysure's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Sep 14, 13:00 (UTC) and the time trial problem is a Akari puzzle that was contributed by Casty.

Announcement of the maintenance work Aug 31, 2007

from Fri, Sep. 7th 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

The Nikoli Derby - 2nd world championship Aug 28, 2007

The Nikoli Derby was developed by nikoli as a party game. It has very simple rules that make it exciting and easy for all, from kids to much older players.

Let's register from "The 2nd Nikoli Derby World Championship" page!!

Entry to The Minority Decides was closed Aug 28, 2007

We will announce the ranking of the game on Tue. Sep 4th.

Entry deadline of the game is Mon. Aug 27, 15:00(UTC)Aug 23, 2007

Please join nikoli original easygoing party game The Minority Decides. The winner will receive an original Nikoli T-shirt.

Result of the 13th nikoli.com Puzzle Championship Aug 17, 2007

Congratulations to Hugo! Hugo won the 13th puzzle championship! Hugo's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Aug 31, 13:00 (UTC) and the time trial problem is a Hitori puzzle that was contributed by mimic.

13th Puzzle Championship Aug 16, 2007

nikoli.com holds 13th puzzle championships on our members page on Fri. Aug 17 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

The Minority Decides Aug 1, 2007

This is a nikoli original easygoing party game. To take part you choose "yes" or "no" for the questions at the entry page. The winner will receive an original Nikoli T-shirt.

Result of the 12th nikoli.com Puzzle Championship Aug 3, 2007

Congratulations to jyokun! jyokun won the 12th puzzle championship! jyokun's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Aug 17, 13:00(UTC) and the time trial problem is a Nurikabe puzzle that was contributed by juno.

12th Puzzle Championship Aug 2, 2007

nikoli.com holds 12th puzzle championships on our members page on Fri. Aug 3 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 11th nikoli.com Puzzle Championship Jul 20, 2007

Congratulations to tarotaro! tarotaro won the 11th puzzle championship! tarotaro's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Aug 3, 13:00(UTC) and the time trial problem is a Heyawake puzzle that was contributed by NyanBaz.

11th Puzzle Championship Jul 20, 2007

nikoli.com holds 11th puzzle championships on our members page on Fri. Jul 20 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Shikaku!! Jul 10, 2007

Shikaku puzzle nikoli.com started to release Shikaku puzzles in the members area from Jul 10th(JST).

Result of the 10th nikoli.com Puzzle Championship Jul 6, 2007

Congratulations to gori.sh! gori.sh won the 10th puzzle championship! gori.sh's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Jul 20, 13:00(UTC) and the time trial problem is a Kakuro puzzle that was contributed by -4.

Shikaku sample problems added Jun 28, 2007

nikoli.com now has 10 sample problems of Shikaku puzzles. The 2 added problems are "Hard". Give them a try. Can you already solve hard Shikaku problems?

nikoli.com will start to release Shikaku puzzles in the members area from Jul 10th.

9th Puzzle Championship Jun 22, 2007

nikoli.com holds 9th puzzle championships on our members page on Fri. Jun 22 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Rules of Shikaku puzzle Jun 19, 2007

Check the "How to play" link for the Shikaku puzzle. That way you will learn know how to operate the puzzle user interface using Flash.

Result of the 9th nikoli.com Puzzle Championship Jun 22, 2007

Congratulations to uri! uri won the 9th puzzle championship! uri's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Jul 6, 13:00(UTC) and the time trial problem is a Slitherlink puzzle that was contributed by crimson.

Added sample problems of Shikaku Jun 21, 2007

Three sample problems of Shikaku are opened to the public.

8th puzzle of nikoli.com is Shikaku Jun 15, 2007

Shikaku puzzle nikoli.com will start publishing Shikaku puzzles in our members area from July. Try out the sample puzzles of Shikaku to get to know this wonderful puzzle.

Dog pictures for difficulty marks.Jun 12, 2007

ExtraHardMediumEasy Try out the dog icons on the appearance setting page. The pictures are from our members.

Result of the 8th nikoli.com Puzzle Championship Jun 8, 2007

Congratulations to Hammy! Hammy won the 8th puzzle championship! Hammy's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Jun 22, 13:00(UTC) and the time trial problem is a Akari puzzle that was contributed by mimic.

8th Puzzle Championship Jun 7, 2007

nikoli.com holds 8th puzzle championships on our members page on Fri. Jun 8 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Frequently Asked Question May 23, 2007

We have added contents of the Frequently Asked Question of the nikoli.com.

Result of the 7th nikoli.com Puzzle Championship May 11, 2007

Congratulations to motris! motris won the 7th puzzle championship! motris's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Jun 8, 13:00(UTC) and the time trial problem is a Hitori puzzle that was contributed by mimic.

7th Puzzle Championship May 24, 2007

nikoli.com holds 7th puzzle championships on our members page on Fri. May 25 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 6th nikoli.com Puzzle Championship May 11, 2007

Congratulations to aji! aji won the 6th puzzle championship! aji's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from May 25, 13:00(UTC) and the time trial problem is a Sudoku puzzle that was contributed by TAKEI Daisuke.

Update Flash program of Heyawake and Hitori May 14, 2007

Please check the "How to play using Flash" pages of each puzzle.

Results of the Nikoli Derby - 1st world championship May 11, 2007

The Nikoli Derby was developed by nikoli as a party game.

Look here for the results of The Nikoli Derby - 1st world championship.

6th Puzzle Championship May 10, 2007

nikoli.com holds 6th puzzle championships on our members page on Fri. May 11 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Entry to The Nikoli Derby was closed May 1, 2007

We will announce the ranking of all participants of The Nikoli Derby on Fri. May 11th.

5th Puzzle Championship Apr 26, 2007

nikoli.com holds 5th puzzle championships on our members page on Fri. Apr 27 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Announcement of the maintenance work Apr 24, 2007

About 10 minutes after 05:00 Apr 27, 2007(UTC).

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Result of the 5th nikoli.com Puzzle Championship Apr 27, 2007

Congratulations to moku! moku won the 5th puzzle championship! moku's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from May 11, 13:00(UTC) and the time trial problem is a Nurikabe puzzle that was contributed by aspirin.

nikoli.com original T-shirt Apr 25, 2007

nikoli.com original T-shirt This is the nikoli.com original T-shirt. It is not for sale, you have to win it!

Banners and Links Apr 20, 2007

Banners We have prepared banners that you may use as links to nikoli.com. Please add a link to nikoli.com from your web site or blog.

Result of the 4th nikoli.com Puzzle Championship Apr 13, 2007

Congratulations to uri! uri won the 4th puzzle championship! uri's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Apr 27, 13:00(UTC) and the time trial problem is a Heyawake puzzle that was contributed by OX.

4th Puzzle Championship Apr 12, 2007

nikoli.com holds 4th puzzle championships on our members page on Fri. Apr 13 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Customize the appearance of the members area Apr 7, 2007

Difficulty marksYou can customize font size and the appearance of the members pages.

Don't give cow's milk to kittens or adult cats. Apr 1, 2007

cat Cow milk is not healthy for cats, because they can't digest it and it will cause diarrhea.

nikoli.com highly recommends cat milk, it contains plenty of proteins and nutrition.

Result of the 3rd nikoli.com Puzzle Championship Mar 30, 2007

Congratulations to FUMIKAZU! FUMIKAZU won the 3rd puzzle championship! FUMIKAZU's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.

The next puzzle championship will be held from Apr 13, 13:00(UTC) and the time trial problem is a Slitherlink puzzle that was contributed by aspirin.

The Nikoli Derby - 1st world championship Mar 28, 2007

The Nikoli Derby was developed by nikoli as a party game. It has very simple rules that make it exciting and easy for all, from kids to much older players.

Let's register from "The 1st Nikoli Derby World Championship" page!!

Getting around Safari1.x and Flash Player9 problems Mar 27, 2007

If you use Safari1.x with Flash Player9, you will be unable to register the solved puzzle history at the members page of nikoli.com. Please refer the "Getting around Safari1.x and Flash Player9 problems" page.

Announcement of the maintenance work Mar 26, 2007

About 10 minutes after 05:00 Mar 27, 2007(UTC).

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Maintenance finished Mar 27, 2007

About 5 minutes after 05:00 Mar 27, 2007(UTC).

Due to scheduled maintenance, you could not access to the members pages of nikoli.com. Sorry for the inconvenience.

Result of the 2nd nikoli.com Puzzle Championship Mar 16, 2007

The winner of the 2nd puzzle championship was gori.sh! You are able to try this time trial problem at the Puzzle Championship page. Can you solve OX's great problem?

2nd Puzzle Championship Mar 14, 2007

nikoli.com holds 2nd puzzle championships on our members page on Fri. Mar 16 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Result of the 1st nikoli.com Puzzle Championship Mar 3, 2007

The winner of the 1st puzzle championship was mimic! You are able to try this time trial problem at the Puzzle Championship page. Can you solve TAKEI Daisuke's great problem?

Problem addition service Mar 1, 2007

This service is for new members who want to have more puzzles to solve.

If the number in the "Total" column of your "Collection of problems" table is larger than the number in the "Playable" column you will be able to add new puzzles.

Maintenance finished Feb 27, 2007

About 3 minutes after 06:00 Feb 27, 2007(UTC).

Due to scheduled maintenance, you could not access to the members pages of nikoli.com. Sorry for the inconvenience.

Announcement of the maintenance work Feb 25, 2007

About 10 minutes after 06:00 Jan 27, 2007(UTC).

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

nikoli.com Puzzle Championship Feb 23, 2007

nikoli.com holds puzzle championships on our members page on Fri. Mar 2 at 13:00(UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Server maintenance work finished Feb 14, 2007

Wed, Feb. 14th 05:00 to 15:20(UTC)

Apologies. Due to site maintenance you were not able to access the members page of nikoli.com during the above time.

Emergency server maintenance (update) Feb 13, 2007

from Wed, Feb. 14th 05:00(UTC), about 1 or 2 hours

We are sorry. Because of maintenance work, you will not able to get access to the nikoli.com members pages during that time.

Emergency server maintenanceFeb 10, 2007

Member's server of nikoli.com needs emergency hardware maintenance after a few days.

We will announce detailed maintenance schedule when we knew that. Sorry for the inconvenience.

Added Google Search and Ads Jan 18, 2007

We hope you find them useful.

Announcement of the maintenance work Jan 18, 2007

About 10 minutes after 06:00 Jan 22, 2007(UTC).

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

Update flash program Jan 11, 2007

Now you can change the "this is not black cell" mark of Heyawake and Hitori.

Use the space key when you input memo numbers in Kakuro and Sudoku using the keyboard.

You can check which numbers are possible in Kakuro by clicking the hint button, but only when there is just one combination left and there are 2 to 7 cells in the string.

nikoli.com opened!! Dec 10, 2006

nikoli.com started on Dec 10, 2006(JST). We will publish new puzzles everyday.

>>> Members page

How to play puzzles using Flash Dec 6, 2006

How to play puzzles using FlashCheck the "How to play" link for the puzzle you want to play. That way you will learn know how to operate the puzzle user interface using Flash.

Recommended environment of nikoli.com Dec 6, 2006

We have added information about the recommended environment of nikoli.com. Please check this page, if you couldn't do our puzzles.

December 9th 09:00; we will start registration of members! Nov 30, 2006

Yes, as you know, nikoli.com starts December 9, 15:00(UTC) and as we are sure everybody wants to solve puzzles from the very start of nikoli.com, we start registration from December 9, 09:00(UTC). Remember, if you register you will be able to enjoy the site when it opens - December 9, 2006 15:00(UTC).

Register before we start, and you are off to great puzzle solving! We look forward to see you in the members page of nikoli.com.

Members page of nikoli.com coming soon Nov 29, 2006

Members page of nikoli.com will open on December 1st.

We will accept registration of membership from 10th December(JST). Please check the "How to join" page.

Added sample problems Nov 22, 2006

nikoli.com opened 10 sample problems of all 7 kind of puzzles. The difficulty of added 14 problems are "Hard". Can you solve them?

Added sample problems Nov 15, 2006

Numbers of each sample problems become 8. Let's enjoy nikoli.com original puzzles.

Added sample problems Nov 8, 2006

Let's try sample problems of Sudoku.

nikoli.com will public 10 sample problems of each puzzles before start of members page.

Added sample problems Nov 2, 2006

Sample problems of Nurikabe and Hitori are opened to the public.

Added sample problems Oct 27, 2006

Sample problems of Heyawake and Karuro are opened to the public.

Sample problems Oct 27, 2006

Sample problems of Slitherlink and Akari are opened to the public.

nikoli.com Coming Soon!!

This is good news for Nikoli Puzzle lovers!

Nikoli has just started to make up an original web site. This site, you can enjoy new Nikoli puzzles everyday. Chief producer Nob Kanamoto said "We want to offer this site for pencil puzzle lovers all over the world. URL is http://www.nikoli.com. I will do my best to launch it within this year. Please wait for a while."

Please note, December 10th(JST), 2006!! members page of nikoli.com will start.