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Announcement of the maintenance work Jan 15, 2018

from Fri, Jan. 19 05:00(UTC), about 2 hours

You will not able to get access to the nikoli.com during this time. Sorry for the inconvenience.

About future of nikoli.com Jan 10, 2018

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

Added Heyawake and Masyu puzzles to The pick of the puzzles page Jan 9, 2018

Most popular Heyawake and Masyu puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Result of the 283rd nikoli.com Puzzle Championship Jan 5, 2018

Congratulations! deu won the 283rd 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. Jan 21, 2018 13:00 (UTC). The time trial problem will be a Heyawake puzzle contributed by the ax and sword.

The Nikoli Derby - 17th world championship Dec 14, 2017

The Nikoli Derby - 17th world championship Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt.

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.

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