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About 130 new puzzles a month!

Members of nikoli.com can enjoy new puzzles everyday at your own exclusive page.

No payment is necessary for the first month by credit card. A perfect chance to enjoy and get to know nikoli.com.

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What's new

"Champion's arm" complete and ready for use! Apr 1, 2015

Nikoli has secretly developed a device which will make anyone a winner in puzzle championships. The whole device is ready for operation. We call it "Champion's arm"! It improves your physical faculties and lets you become a champion!

Click here for details.

Results of the Nikoli Derby - 14th world championship Mar 24, 2015

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

Look here for the results of The Nikoli Derby - 14th world championship.

We hope you are one of the winners!

Result of the 210th nikoli.com Puzzle Championship Mar 22, 2015

Congratulations! hijiring and wrhtnarz won the 210th 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. Apr 4, 2015 13:00 (UTC). The time trial problem will be a Kakuro puzzle contributed by -4.

Maintenance finished Mar 20, 2015

About 15 minutes after 05:00 Mar 20, 2015(UTC).

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

Added Hitori, Kakuro and Ripple Effect puzzles to The pick of the puzzles page Mar 3, 2015

Most popular Hitori, Kakuro and Ripple Effect puzzles are available to members. Play them in the members area, in The pick of the puzzles page.

Added Botsu Bako problem Feb 24, 2015

Asaokitan's Nurikabe problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.

Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Feb 3, 2015

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

Author interviews Vol.41Jan 13, 2015

Our guest this time is oku-yama. He is in his early 30s. He is doing clerical work. He tells us that it's the type of job where he is required to be very very cautious.


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