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Result of the 228th nikoli.com Puzzle Championship Nov 28, 2015

Congratulations! POTS won the 228th 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 12, 2015 13:00 (UTC). The time trial problem will be a Akari puzzle contributed by 36.

Maintenance finished Nov 20, 2015

About 10 minutes after 05:00 Nov 20, 2015(UTC).

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

24 hour janken - 1st world championship Nov 17, 2015

The 24 hour janken - 1st world championship Please join nikoli original easygoing party game The 24 hour janken. The winners will receive an original Nikoli T-shirt.

Added Botsu Bako problem Nov 9, 2015

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

Added Nurikabe, Numberlink and Satogaeri puzzles to The pick of the puzzles page Nov 4, 2015

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

Results of the Nikoli Derby - 15th world championship Oct 6, 2015

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

Look here for the results of The Nikoli Derby - 15th world championship.

We hope you are one of the winners!

One Layout Sudokus Jul 17, 2015

One Layout Sudokus This is our 3rd "One layout" project. Here we have 20 of these sudoku puzzles. Try them out!

Author round-table Vol.23Apr 15, 2015

Here today we have Guten a very familiar author who created Shakashaka. And we also have HIRO FUKUSHIMA who thought up the Heyawake rules. We will talk about "Omopa" today.

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