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Information -+

Result of the 233rd nikoli.com Puzzle ChampionshipFeb 6, 2016

Congratulations! hrs won the 233rd 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. Feb 20, 2016 13:00 (UTC). We will set 2 kind of the time trial problems at the same time. Both puzzles are Satogaeri puzzles, contributed by Casty and the ax and sword.

Added Akari and Hashiwokakero to The pick of the puzzles pageFeb 2, 2016

Added Akari and Hashiwokakero to The pick of the puzzles page in the members only corner.

Results of the 24 hour janken GameJan 26, 2016

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.

Maintenance finished Jan 15, 2016

About 40 minutes after 05:00 Jan 15, 2016(UTC).

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

Added Botsu Bako problem Jan 13, 2016

Guten's Shakashaka problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members only corner.

One Layout SudokusJul 17, 2015

This is our 3rd "One layout" project. Here we have 20 of these sudoku puzzles. Try them out!

Author round-table Vol.23Apr 15, 2015

Here today we have Guten a very familiar author who created Shakashaka. And we also have HIRO FUKUSHIMA who thought up the Heyawake rules. We will talk about "Omopa" today.

Recent puzzles

The problems in the table have been published within the last 1 week (168 hours). You can find older problems in the "Collection of problems".

You can enjoy     cells problems, if you are a member.

TypeSizeLevelAuthorPublished
Numberlink10x10

10x10

Medium

alkalineFeb 8, 2016 03:00(UTC)
Solve problemSudoku9x9

9x9

Medium

CastyFeb 8, 2016 03:00(UTC)
Shikaku10x10

10x10

Easy

cubic functionFeb 7, 2016 21:00(UTC)
Masyu24x14

24x14

Hard

Pencil RocketFeb 7, 2016 15:00(UTC)
Shakashaka24x14

24x14

Hard

GutenFeb 7, 2016 15:00(UTC)
Hitori12x12

12x12

Medium

aikoFeb 7, 2016 03:00(UTC)
Kakuro21x13

21x13

Hard

Ogawa MinoriFeb 7, 2016 03:00(UTC)
Heyawake 10x10

10x10

Easy

alkalineFeb 6, 2016 21:00(UTC)
Akari36x20

36x20

Hard

T.KarinoFeb 6, 2016 15:00(UTC)
Norinori36x20

36x20

Hard

CastyFeb 6, 2016 15:00(UTC)
Slitherlink

Time trial problem

45x31

45x31

Extra

the ax and swordFeb 6, 2016 13:00(UTC)
Shakashaka24x14

24x14

Hard

-4Feb 6, 2016 03:00(UTC)
Satogaeri18x10

18x10

Medium

Ogawa MinoriFeb 6, 2016 03:00(UTC)
Nurikabe 18x10

18x10

Hard

AsaokitanFeb 5, 2016 15:00(UTC)
Solve problemHashiwokakero9x9

9x9

Easy

aquablueFeb 5, 2016 15:00(UTC)
Solve problemAkari10x10

10x10

Easy

aikoFeb 5, 2016 03:00(UTC)
Shikaku24x14

24x14

Hard

bay wolf JrFeb 5, 2016 03:00(UTC)
Masyu18x10

18x10

Medium

akasyoFeb 4, 2016 15:00(UTC)
Yajilin36x20

36x20

Hard

-4Feb 4, 2016 15:00(UTC)
Hashiwokakero16x9

16x9

Easy

CastyFeb 4, 2016 03:00(UTC)
Norinori10x10

10x10

Medium

T.KarinoFeb 4, 2016 03:00(UTC)
Hitori12x12

12x12

Medium

aquablueFeb 3, 2016 21:00(UTC)
Numberlink18x10

18x10

Hard

GutenFeb 3, 2016 15:00(UTC)
Ripple Effect18x10

18x10

Hard

-4Feb 3, 2016 15:00(UTC)
Slitherlink10x10

10x10

Easy

MiyaFeb 3, 2016 03:00(UTC)
Solve problemSudoku9x9

9x9

Easy

POTSFeb 3, 2016 03:00(UTC)
Shakashaka18x10

18x10

Medium

Ogawa MinoriFeb 2, 2016 21:00(UTC)
Heyawake 36x20

36x20

Hard

T.KarinoFeb 2, 2016 15:00(UTC)
Akari24x14

24x14

Hard

nyoroppyiFeb 2, 2016 15:00(UTC)
Nurikabe 18x10

18x10

Medium

KenjaFeb 2, 2016 03:00(UTC)
Masyu10x10

10x10

Easy

-4Feb 2, 2016 03:00(UTC)
Satogaeri24x14

24x14

Hard

bay wolf JrFeb 1, 2016 15:00(UTC)
Solve problemKakuro11x9

11x9

Easy

T.KarinoFeb 1, 2016 15:00(UTC)

Collection of problems

TypeTotalPlayableUnsolvedOnly openIncompleteSolved
Slitherlink5266000
Nurikabe 5977000
Heyawake 6077000
Akari6566000
Hitori4666000
Masyu5266000
Shikaku5977000
Hashiwokakero5877000
Numberlink4877000
Yajilin5166000
Shakashaka5966000
Satogaeri5166000
Norinori5266000
Kakuro4077000
Sudoku402020000
Ripple Effect3966000

Members who has maximum numbers of problem can play "Total" numbers of problems. Guest can enjoy "Playable" problems.