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.mediteran13
41
00:07.45
2.sfumato
68
00:09.20
3.EinsteinsBarber
40
00:17.91
4.RNGesusWept
11
00:30.49
5.Kutner17
37
00:33.56
6.brac3700:48.29
7.Opsosaurus
18
00:48.42
8.rwh0003
27
00:55.78
9.schapel
14
00:56.22
10.ambiorix00:58.56
11.ethan781
33
00:59.30
12.s56squared01:02.08
13.Dicko-san
44
01:05.32
14.David Hwang
9
01:05.60
15.Gregory01:07.46
16.Jbrunt
26
01:12.79
17.GeorgW
22
01:12.91
18.Sawdust9901:20.33
19.rae wolf
4
01:46.39
20.Dan38002:02.67
This Week
1.sfumato
68
00:09.98
2.RNGesusWept
11
00:34.15
3.ethan781
33
00:59.30
4.s56squared01:02.08
5.GeorgW
22
01:12.91
6.Gregory01:13.43
7.Sawdust9901:35.74
8.Dan38002:02.67
9.Uri Gotman
28
02:21.86
10.ea mathieu
7
02:37.71
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Today
1.RNGesusWept
11
00:34.15
2.s56squared01:15.76
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4.--- empty -----:--
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MO3
1.mediteran13
41
00:09.65
2.sfumato
68
00:13.38
3.EinsteinsBarber
40
00:23.01
4.Meep
77
00:32.92
5.morecookies
18
00:34.96
6.RNGesusWept
11
00:40.27
7.Kutner17
37
00:41.44
8.Alpacastro
22
00:42.68
9.Ramasp
91
00:46.86
10.axu6822
44
00:54.50
AO5
1.mediteran13
41
00:10.35
2.sfumato
68
00:12.04
3.EinsteinsBarber
40
00:25.09
4.morecookies
18
00:34.96
5.Meep
77
00:39.61
6.Kutner17
37
00:41.70
7.RNGesusWept
11
00:45.65
8.Ramasp
91
00:49.27
9.Alpacastro
22
00:58.66
10.axu6822
44
00:59.48
AO12
1.mediteran13
41
00:44.80
2.Ramasp
91
00:53.18
3.Kutner17
37
01:05.97
4.RNGesusWept
11
01:07.60
5.axu6822
44
01:23.58
6.Oc
17
02:04.40
7.Zhuangfei Hu
12
03:12.84
8.GeorgW
22
03:18.41
9.Teal
51
05:38.50
10.E4250
14
08:05.96
Robots / programmatic solversinfo  
1.nbjohnson00:00.436
2.Charlie Li
60
00:00.446
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 15:57:42

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