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. boru
103
00:02.54
2. ♡furina♡
20
00:03.43
3. afidaleo
117
00:04.61
4. cheyette 00:05.09
5. SirFish 00:05.33
6. SlugBugBlue 00:05.35
7. Elias Westerbergh
46
00:05.41
8. HackMan
102
00:06.03
9. FunAcroFly
58
00:06.30
10. lwc2882 00:07.97
11. EthrDemon 00:08.73
12. billybool 00:10.80
13. Strider500
46
00:12.09
14. Partimento
24
00:13.84
15. Fredrik Persson
8
00:24.25
16. imlumensdog
5
00:29.15
17. SnowCrash 00:32.24
18. wawa
33
00:36.56
19. sisi
19
00:38.32
20. shangdou
18
01:13.18
This Week
1. afidaleo
117
00:04.61
2. cheyette 00:05.09
3. HackMan
102
00:06.03
4. FunAcroFly
58
00:10.37
5. SnowCrash 00:32.24
6. wawa
33
00:36.56
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MO3
1. vowels
214
00:01.23
2. Douglas Shamlin Jr.
689
00:01.37
3. BingBongBob
107
00:01.56
4. haramey
229
00:01.68
5. sfumato
166
00:01.76
6. nabi
92
00:01.78
7. bearn
206
00:02.00
8. numbrr
292
00:02.09
9. qqwref
259
00:02.11
10. jaybrainer
230
00:02.12
AO5
1. vowels
214
00:01.42
2. Douglas Shamlin Jr.
689
00:01.43
3. BingBongBob
107
00:01.56
4. nabi
92
00:01.77
5. haramey
229
00:01.81
6. sfumato
166
00:01.92
7. bearn
206
00:02.08
8. jaybrainer
230
00:02.14
9. numbrr
292
00:02.16
10. mediteran13
54
00:02.32
AO12
1. vowels
214
00:01.61
2. Douglas Shamlin Jr.
689
00:01.64
3. BingBongBob
107
00:01.91
4. nabi
92
00:02.17
5. sfumato
166
00:02.24
6. bearn
206
00:02.27
7. haramey
229
00:02.29
8. jaybrainer
230
00:02.43
9. jai22933
23
00:02.48
10. numbrr
292
00:02.59
Robots / programmatic solversinfo  
1.cheyette00:00.144
2.Charlie Li
61
00:00.205
3.4s4f400:00.241

* 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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2025-05-25 05:20:05

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