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243rd Puzzle ChampionshipJun 24, 2016

nikoli.com holds 243rd Puzzle Championship on our members page on Sun. Jun 26, 2016 13:00 (UTC). The first correct solution is the winner. Start right away and hurry, race, dash to solve it and submit it immediately!

Time trial problem will appear in the table of "Recent puzzles" at 13:00(UTC).

Maintenance finished Jun 17, 2016

About 10 minutes after 05:00 Jun 17, 2016(UTC).

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

Added Botsu Bako problem Jun 6, 2016

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

Added Shikaku, Sudoku and Shakashaka to The pick of the puzzles pageJun 1, 2016

Added Shikaku, Sudoku and Shakashaka to The pick of the puzzles page in the members only corner.

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
Shikaku10x10

10x10

Easy

alkalineJun 24, 2016 21:00(UTC)
Heyawake 24x14

24x14

Hard

the ax and swordJun 24, 2016 15:00(UTC)
Akari36x20

36x20

Hard

GutenJun 24, 2016 15:00(UTC)
Hashiwokakero16x9

16x9

Medium

aikoJun 24, 2016 03:00(UTC)
Solve problemSatogaeri10x10

10x10

Easy

Ogawa MinoriJun 24, 2016 03:00(UTC)
Slitherlink18x10

18x10

Medium

POTSJun 23, 2016 15:00(UTC)
Nurikabe 36x20

36x20

Hard

MINEJun 23, 2016 15:00(UTC)
Solve problemNumberlink10x10

10x10

Easy

-4Jun 23, 2016 03:00(UTC)
Kakuro19x11

19x11

Medium

aquablueJun 23, 2016 03:00(UTC)
Shakashaka18x10

18x10

Medium

aikoJun 22, 2016 21:00(UTC)
Masyu24x14

24x14

Hard

oku-yamaJun 22, 2016 15:00(UTC)
Yajilin24x14

24x14

Hard

36Jun 22, 2016 15:00(UTC)
Heyawake 10x10

10x10

Easy

SAKAMOTO, NobuyukiJun 22, 2016 03:00(UTC)
Solve problemSudoku9x9

9x9

Medium

CastyJun 22, 2016 03:00(UTC)
Shikaku18x10

18x10

Medium

aquablueJun 21, 2016 15:00(UTC)
Norinori36x20

36x20

Hard

Ogawa MinoriJun 21, 2016 15:00(UTC)
Hitori8x8

8x8

Easy

-4Jun 21, 2016 03:00(UTC)
Satogaeri36x20

36x20

Medium

CastyJun 21, 2016 03:00(UTC)
Slitherlink24x14

24x14

Hard

SAKAMOTO, NobuyukiJun 20, 2016 15:00(UTC)
Akari18x10

18x10

Medium

bay wolf JrJun 20, 2016 15:00(UTC)
Nurikabe 18x10

18x10

Medium

CastyJun 20, 2016 03:00(UTC)
Ripple Effect8x8

8x8

Easy

-4Jun 20, 2016 03:00(UTC)
Hashiwokakero32x18

32x18

Hard

T.KarinoJun 19, 2016 15:00(UTC)
Yajilin18x10

18x10

Medium

GutenJun 19, 2016 15:00(UTC)
Shakashaka10x10

10x10

Easy

-4Jun 19, 2016 03:00(UTC)
Norinori18x10

18x10

Medium

nyoroppyiJun 19, 2016 03:00(UTC)
Shikaku24x14

24x14

Hard

CastyJun 18, 2016 21:00(UTC)
Heyawake 36x20

36x20

Extra

GutenJun 18, 2016 15:00(UTC)
Akari36x20

36x20

Hard

T.KarinoJun 18, 2016 15:00(UTC)
Hitori17x17

17x17

Hard

SAKAMOTO, NobuyukiJun 18, 2016 03:00(UTC)
Hashiwokakero9x9

9x9

Easy

Ogawa MinoriJun 18, 2016 03:00(UTC)

Collection of problems

TypeTotalPlayableUnsolvedOnly openIncompleteSolved
Slitherlink5277000
Nurikabe 5866000
Heyawake 5966000
Akari6466000
Hitori4666000
Masyu5377000
Shikaku5966000
Hashiwokakero5866000
Numberlink4577000
Yajilin5277000
Shakashaka5966000
Satogaeri5477000
Norinori5266000
Kakuro4077000
Sudoku402020000
Ripple Effect3977000

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