Nurikabe


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Nurikabe is a logic puzzle with a bit complicated rules and challenging solutions.

The rules are not so simple. :)
You have a grid of squares Some cells of the grid start containing numbers. The goal is to determine whether each of the cells of the grid is "black" or "white" (Islands in the Stream calls these "water" and "land" respectively). The black cells form "the nurikabe" (Islands in the Stream calls it "the stream"): they must all be orthogonally contiguous (form a single polyomino), number-free, and contain no 2x2 or larger solid rectangles (Islands in the Stream calls such illegal blocks "pools"). The white cells form "islands" (which is where Islands in the Stream got its name): each number n must be part of an n-omino composed only of white cells. All white cells must belong to exactly one island; islands must have exactly one numbered cell. Solvers will typically shade in cells they have deduced to be black and dot (non-numbered) cells deduced to be white.
Left click on a square to make it black. Right click to mark with dot. Click and drag to mark more than one square.

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Nurikabe


5x5 Easy Nurikabe | 5x5 Hard Nurikabe | 7x7 Easy Nurikabe | 7x7 Hard Nurikabe | 10x10 Easy Nurikabe | 10x10 Hard Nurikabe | 12x12 Easy Nurikabe | 12x12 Hard Nurikabe | 15x15 Easy Nurikabe | 15x15 Hard Nurikabe | 20x20 Easy Nurikabe

This Month
1. RelaxedCockatoo
64
00:03.02
2. MANUWIND 00:03.61
3. Sasquatch 00:03.73
4. Jovess 00:04.40
5. jamiecjx
68
00:04.46
6. tailor 00:04.52
7. missPear
76
00:05.07
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9. lwc2882 00:05.75
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11. Ootshe MMS
2
00:06.28
12. HackMan
98
00:06.48
13. Strider500
26
00:07.27
14. albertzen95
2
00:07.35
15. Determined1 00:07.63
16. Paola González Oliv...
36
00:08.17
17. Koakuma
47
00:08.20
18. JonCausith 00:08.26
19. PersonWhoExists
1
00:08.31
20. 1q2w3e4r5t
19
00:08.72
This Week
1. 127fy 00:05.13
2. lwc2882 00:05.75
3. FunAcroFly
53
00:09.66
4. KingWilliamII 00:11.56
5. kavci
3
00:12.97
6. LtLi0n
13
00:14.25
7. HackMan
98
00:14.51
8. asatzhh
18
00:18.00
9. caroy 00:55.56
10. Abhii
11
01:53.49
11. Soham Bhosale
1
08:19.46
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MO3
1. vowels
214
00:01.35
2. Douglas Shamlin Jr.
685
00:01.45
3. nabi
92
00:01.64
4. haramey
228
00:01.70
5. jaybrainer
226
00:01.75
6. BingBongBob
107
00:01.76
7. sfumato
166
00:01.78
8. bearn
206
00:01.91
9. numbrr
289
00:02.12
10. jai22933
23
00:02.19
AO5
1. vowels
214
00:01.43
2. Douglas Shamlin Jr.
685
00:01.47
3. nabi
92
00:01.50
4. haramey
228
00:01.78
5. jaybrainer
226
00:01.79
6. BingBongBob
107
00:01.88
7. sfumato
166
00:01.89
8. bearn
206
00:01.93
9. jai22933
23
00:02.29
10. numbrr
289
00:02.33
AO12
1. vowels
214
00:01.70
2. Douglas Shamlin Jr.
685
00:01.71
3. nabi
92
00:01.75
4. haramey
228
00:02.06
5. jaybrainer
226
00:02.14
6. bearn
206
00:02.24
7. BingBongBob
107
00:02.27
8. sfumato
166
00:02.29
9. numbrr
289
00:02.56
10. Daheeamond11
95
00:02.58
Robots / programmatic solversinfo  
1.Charlie Li
61
00:00.208
2.nbjohnson00:00.407
3.Paul Bismuth
1
00:00.923

* MO3 - Mean of 3. The average of 3 consecutive times.
AO5 - Average of 5. The average of 5 consecutive times ignoring the highest and the lowest.
AO12 - Average of 12. The average of 12 consecutive times ignoring the highest and the lowest.
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2025-05-01 08:55:24

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