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Information -+

Added Heyawake and Masyu to The pick of the puzzles pageJul 1, 2015

Added Heyawake and Masyu to The pick of the puzzles page in the members only corner.

Result of the 217th nikoli.com Puzzle ChampionshipJun 27, 2015

Congratulations! volxa won the 217th 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. Jul 11, 2015 13:00 (UTC). The time trial problem will be a Shakashaka puzzle contributed by the ax and sword.

Maintenance finished Jun 19, 2015

About 15 minutes after 05:00 Jun 19, 2015(UTC).

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

Added Botsu Bako problem Jun 16, 2015

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

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.

Results of the Nikoli Derby - 14th world championshipMar 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!

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
Heyawake 18x10

18x10

Medium

bay wolf JrJul 7, 2015 15:00(UTC)
Shikaku24x14

24x14

Hard

aikoJul 7, 2015 15:00(UTC)
Nurikabe 18x10

18x10

Medium

SAKAMOTO, NobuyukiJul 7, 2015 03:00(UTC)
Satogaeri18x10

18x10

Medium

-4Jul 7, 2015 03:00(UTC)
Slitherlink36x20

36x20

Hard

CastyJul 6, 2015 15:00(UTC)
Solve problemNorinori10x10

10x10

Easy

nyoroppyiJul 6, 2015 15:00(UTC)
Hashiwokakero16x9

16x9

Easy

-4Jul 6, 2015 03:00(UTC)
Sudoku9x9

9x9

Hard

cubic functionJul 6, 2015 03:00(UTC)
Solve problemHeyawake 10x10

10x10

Easy

GutenJul 5, 2015 15:00(UTC)
Akari24x14

24x14

Hard

T.KarinoJul 5, 2015 15:00(UTC)
Numberlink10x10

10x10

Easy

Ogawa MinoriJul 5, 2015 03:00(UTC)
Yajilin24x14

24x14

Hard

CastyJul 5, 2015 03:00(UTC)
Shakashaka18x10

18x10

Medium

aquablueJul 4, 2015 21:00(UTC)
Shikaku45x31

45x31

Hard

aikoJul 4, 2015 15:00(UTC)
Ripple Effect18x10

18x10

Hard

-4Jul 4, 2015 15:00(UTC)
Hitori8x8

8x8

Easy

GutenJul 4, 2015 03:00(UTC)
Masyu36x20

36x20

Hard

CastyJul 4, 2015 03:00(UTC)
Kakuro19x11

19x11

Hard

KenjaJul 3, 2015 21:00(UTC)
Heyawake 36x20

36x20

Hard

the ax and swordJul 3, 2015 15:00(UTC)
Akari24x14

24x14

Medium

-4Jul 3, 2015 15:00(UTC)
Solve problemNurikabe 10x10

10x10

Easy

AsaokitanJul 3, 2015 03:00(UTC)
Norinori18x10

18x10

Medium

GutenJul 3, 2015 03:00(UTC)
Shikaku18x10

18x10

Medium

CastyJul 2, 2015 15:00(UTC)
Satogaeri24x14

24x14

Hard

aikoJul 2, 2015 15:00(UTC)
Solve problemSlitherlink10x10

10x10

Easy

T.KarinoJul 2, 2015 03:00(UTC)
Hashiwokakero16x9

16x9

Medium

MomotereuJul 2, 2015 03:00(UTC)
Numberlink18x10

18x10

Medium

-4Jul 1, 2015 15:00(UTC)
Shakashaka36x20

36x20

Hard

CastyJul 1, 2015 15:00(UTC)
Nurikabe 18x10

18x10

Medium

aquablueJul 1, 2015 03:00(UTC)
Solve problemYajilin10x10

10x10

Easy

GutenJul 1, 2015 03:00(UTC)
Norinori24x14

24x14

Hard

T.KarinoJun 30, 2015 21:00(UTC)

Collection of problems

TypeTotalPlayableUnsolvedOnly openIncompleteSolved
Slitherlink5277000
Nurikabe 6688000
Heyawake 6677000
Akari6666000
Hitori4566000
Masyu5866000
Shikaku5977000
Hashiwokakero5866000
Numberlink4666000
Yajilin5877000
Shakashaka5877000
Satogaeri4666000
Norinori3477000
Kakuro3966000
Sudoku401919000
Ripple Effect3966000

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