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. Min._.下(KR)
101
00:21.99
2. BbaKgANg
9
00:28.01
3. Dunnowhattodo
205
00:53.60
4. Sloth131079 00:55.96
5. thost 01:08.85
6. wam3988 01:11.54
7. SHIN LEECHEOL
90
01:12.75
8. 222champ 01:35.66
9. Jonikles
12
01:37.49
10. MOONEE
16
01:40.75
11. Solander
60
01:49.47
12. Dan380 01:54.84
13. Dorice
242
01:56.87
14. xtalotov_mocktail
11
01:59.03
15. ypw19
76
02:03.41
16. Thrillhou 02:06.90
17. JohnnyB 02:09.41
18. AzuReVaPouR 02:09.64
19. toryxthebanana#0
12
02:13.02
20. FunAcroFly
76
02:14.86
This Week
1. Min._.下(KR)
101
00:26.23
2. BbaKgANg
9
00:28.01
3. wam3988 01:11.54
4. SHIN LEECHEOL
90
01:12.75
5. Solander
60
01:51.57
6. Dan380 02:10.31
7. JohnnyB 02:12.88
8. TJ11235
11
03:12.24
9. Dereham
50
03:28.58
10. toryxthebanana#0
12
03:48.28
11. beardedfoot
17
05:13.22
12. Joris Brouwer
39
05:42.18
13. marisal 06:42.88
14. SH1T7Yk17TY 24d 20:31:23.64
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Today
1. Dan380 02:10.31
2. TJ11235
11
03:12.24
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4.--- empty -----:--
5.--- empty -----:--
6.--- empty -----:--
7.--- empty -----:--
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MO3
1. numbrr
297
00:21.64
2. bearn
206
00:21.71
3. Min._.下(KR)
101
00:29.04
4. haramey
230
00:31.17
5. vowels
216
00:31.80
6. BbaKgANg
9
00:31.99
7. sfumato
166
00:33.67
8. Douglas Shamlin Jr.
693
00:35.78
9. mediteran13
54
00:37.44
10. miggy
128
00:40.34
AO5
1. numbrr
297
00:22.91
2. bearn
206
00:23.48
3. Min._.下(KR)
101
00:29.39
4. BbaKgANg
9
00:31.99
5. haramey
230
00:33.69
6. vowels
216
00:35.13
7. Douglas Shamlin Jr.
693
00:38.99
8. sfumato
166
00:39.00
9. mediteran13
54
00:40.05
10. miggy
128
00:45.96
AO12
1. numbrr
297
00:27.74
2. bearn
206
00:28.93
3. Min._.下(KR)
101
00:35.87
4. vowels
216
00:39.14
5. haramey
230
00:42.44
6. Douglas Shamlin Jr.
693
00:47.20
7. sfumato
166
00:53.19
8. A2Ragnell
17
00:53.52
9. miggy
128
00:57.43
10. zaqNitori
103
00:59.21
Robots / programmatic solversinfo  
1.Charlie Li
61
00:00.232
2.4s4f400:00.574
3.nbjohnson00:00.843

* 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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2025-07-14 23:13:47

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