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Maintenance finished Nov 17, 2017

About 10 minutes after 05:00 Nov 17, 2017(UTC).

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

Result of the 279th nikoli.com Puzzle Championship Nov 12, 2017

Congratulations! Rintaro won the 279th 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 26, 2017 13:00 (UTC). The time trial problem will be a Norinori puzzle contributed by Ogland.

Added Nurikabe, Numberlink and Satogaeri puzzles to The pick of the puzzles page Nov 1, 2017

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

Added Botsu Bako problem Oct 20, 2017

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

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.

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