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Announcement of the maintenance work Dec 11, 2017

from Fri, Dec. 15 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 281st nikoli.com Puzzle Championship Dec 8, 2017

Congratulations! Hazakura-Hazuki won the 281st 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 22, 2017 13:00 (UTC). We will set 2 kinds of problems at the same time. aiko's Ripple Effect and Guten's Hitori are waiting for your challenge.

Added Shikaku, Sudoku and Shakashaka puzzles to The pick of the puzzles page Dec 1, 2017

Most popular Shikaku, Sudoku and Shakashaka 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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