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.sfumato
98
00:14.68
2.tailor00:41.64
3.crouik00:53.57
4.DaveS9100:58.69
5.theboomboy
1
01:40.81
6.Solander01:43.46
7.brac3701:44.38
8.Dorice
85
02:08.79
9.AlexanderIII02:33.80
10.etheerio02:54.58
11.passngrin04:38.13
12.dMoberg04:42.31
13.mts55
31
05:01.44
14.MoFan
33
07:44.43
15.Kseniia Filonenko
24
09:42.44
16.Go5Go
41
17:10.21
17.--- empty -----:--
18.--- empty -----:--
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This Week
1.sfumato
98
00:21.48
2.crouik01:34.79
3.Solander01:43.46
4.Dorice
85
02:26.24
5.passngrin04:38.13
6.MoFan
33
07:44.43
7.--- empty -----:--
8.--- empty -----:--
9.--- empty -----:--
10.--- empty -----:--
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Today
1.Dorice
85
04:00.93
2.--- empty -----:--
3.--- empty -----:--
4.--- empty -----:--
5.--- empty -----:--
6.--- empty -----:--
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8.--- empty -----:--
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MO3
1.mediteran13
53
00:16.12
2.sfumato
98
00:19.20
3.bearn
64
00:19.88
4.IHNN1
6
00:20.27
5.EinsteinsBarber
47
00:29.91
6.Ramasp
104
00:42.99
7.Kurmin
18
00:50.15
8.million
47
00:51.61
9.arcer
65
00:52.68
10.markelobitx
32
01:14.03
AO5
1.mediteran13
53
00:20.45
2.sfumato
98
00:22.83
3.IHNN1
6
00:24.92
4.bearn
64
00:25.31
5.EinsteinsBarber
47
00:38.05
6.Ramasp
104
00:42.99
7.arcer
65
00:53.50
8.million
47
01:04.22
9.markelobitx
32
01:24.40
10.NoahR
117
01:24.48
AO12
1.bearn
64
00:33.19
2.IHNN1
6
00:40.76
3.EinsteinsBarber
47
00:58.10
4.arcer
65
01:03.31
5.jeffafa
79
02:04.08
6.axu6822
50
02:19.36
7.Hanou
12
02:29.53
8.remark
108
02:33.73
9.PeteSF
16
02:45.45
10.Harli
53
03:04.73
Robots / programmatic solversinfo  
1.Charlie Li
60
00:00.473
2.nbjohnson00:00.639
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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2021-10-22 09:42:00

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