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

This Month
1.million
34
00:14.52
2.EinsteinsBarber
40
00:14.58
3.sfumato
68
00:15.08
4.bearn
55
00:19.25
5.Ramasp
91
00:31.78
6.jmp473
17
00:34.07
7.HackMan00:48.36
8.rwh0003
27
00:49.97
9.Kutner17
37
00:53.79
10.schapel
14
00:54.57
11.Jbrunt
26
01:08.09
12.karaklaine
22
01:13.76
13.ambiorix01:15.06
14.tommy8431
23
01:16.29
15.s56squared01:18.60
16.Dorice
69
01:28.02
17.imp
41
01:30.52
18.Dicko-san
44
01:37.21
19.Skyhorse2401:47.74
20.CComMack
11
02:00.60
This Week
1.sfumato
68
00:15.73
2.bearn
55
00:19.25
3.million
34
00:22.95
4.HackMan00:49.66
5.karaklaine
22
01:13.76
6.Dicko-san
44
01:37.21
7.s56squared01:54.82
8.CComMack
11
02:00.60
9.Peanutmobile02:36.87
10.--- empty -----:--
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
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16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
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20.--- empty -----:--
Today
1.CComMack
11
02:00.60
2.--- empty -----:--
3.--- empty -----:--
4.--- empty -----:--
5.--- empty -----:--
6.--- empty -----:--
7.--- empty -----:--
8.--- empty -----:--
9.--- empty -----:--
10.--- empty -----:--
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
15.--- empty -----:--
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
MO3
1.sfumato
68
00:18.38
2.EinsteinsBarber
40
00:21.21
3.bearn
55
00:21.72
4.million
34
00:24.37
5.arcer
48
00:33.98
6.Ramasp
91
00:41.22
7.jmp473
17
00:47.03
8.procrastinator3000
32
00:52.58
9.schapel
14
00:58.30
10.axu6822
44
01:01.32
AO5
1.sfumato
68
00:20.25
2.bearn
55
00:23.23
3.EinsteinsBarber
40
00:24.61
4.million
34
00:28.16
5.arcer
48
00:39.57
6.Ramasp
91
00:46.11
7.jmp473
17
00:56.20
8.procrastinator3000
32
00:59.04
9.axu6822
44
01:03.44
10.schapel
14
01:04.54
AO12
1.EinsteinsBarber
40
00:27.82
2.arcer
48
00:44.97
3.Ramasp
91
01:00.11
4.axu6822
44
01:12.22
5.schapel
14
01:12.73
6.jmp473
17
01:28.96
7.rozer
147
01:31.80
8.tommy8431
23
01:44.62
9.AGecko
15
02:17.89
10.Jbrunt
26
02:29.76
Robots / programmatic solversinfo  
1.nbjohnson00:00.421
2.Charlie Li
60
00:00.433
3.--- empty -----:--

* 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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2021-07-30 16:36:02

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