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Maintenance finished Jun 15, 2018

About 30 minutes after 05:00 Jun 15, 2018(UTC).

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

Result of the 294th nikoli.com Puzzle Championship Jun 9, 2018

Congratulations! Rintaro won the 294th 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. Jun 23, 2018 13:00 (UTC). The time trial problem will be a Ripple Effect puzzle contributed by Subaru_Saito.

Added Shikaku, Sudoku and Shakashaka puzzles to The pick of the puzzles page Jun 1, 2018

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 Feb 16, 2018

bay wolf Jr's Hashiwokakero problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

About future of nikoli.com Jan 10, 2018

We published a page about future of nikoli.com. Please check this page.

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