Added Shikaku, Sudoku and Shakashaka puzzles to The pick of the puzzles page Dec 1, 2016
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 254th nikoli.com Puzzle Championship Nov 26, 2016
Congratulations! Ziti won the 254th 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 9, 2016 13:00 (UTC). The time trial problem will be a Shakashaka puzzle contributed by T.Karino.
Maintenance finished Nov 18, 2016
About 10 minutes after 05:00 Nov 18, 2016(UTC).
Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.
The Nikoli Derby - 16th world championship Nov 10, 2016
Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt.
Added Botsu Bako problem Oct 21, 2016
Guten's Norinori problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.