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Announcement of the maintenance work Oct 16, 2017

from Fri, Oct. 20 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 277th nikoli.com Puzzle Championship Oct 15, 2017

Congratulations! sinh9 won the 277th 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 29, 2017 13:00 (UTC). The time trial problem will be a Shikaku puzzle contributed by the ax and sword.

Added Slitherlink, Yajilin and Norinori puzzles to The pick of the puzzles page Oct 2, 2017

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

Results of the 24 hour janken Sep 12, 2017

24 hour janken is a simple and easy game. It is a championship with janken (the well known rock-paper-scissors game), which is a popular game among Japanese.

Look here for the results of the 24 hour janken.

Added Botsu Bako problem Jul 21, 2017

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

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