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
68
00:24.03
2.mediteran13
41
00:27.30
3.themathkid
32
01:19.10
4.contrapdx01:26.33
5.Ramasp
91
01:29.32
6.leftq01:35.05
7.Dunnowhattodo
54
01:37.00
8.guvnor01:42.75
9.SheaButter
20
01:54.60
10.Tezexlo02:04.90
11.aewpoij02:09.80
12.teliot02:11.74
13.Zigcack02:18.49
14.AG721
24
02:23.74
15.EthrDemon02:30.51
16.Ontwikseltsaar
36
02:31.23
17.Thrillhou02:32.38
18.jiugan
32
02:39.05
19.JohnnyB02:40.94
20.selenae03:04.46
This Week
1.sfumato
68
00:31.76
2.leftq01:35.05
3.SheaButter
20
01:59.67
4.Zigcack02:18.49
5.JohnnyB02:40.94
6.AG721
24
02:49.25
7.Thrillhou02:50.66
8.s56squared03:26.39
9.alessi03:54.24
10.Dan38009:59.96
11.W K
8
53:29.03
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Today
1.JohnnyB03:17.02
2.Zigcack03:51.22
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4.--- empty -----:--
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6.--- empty -----:--
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8.--- empty -----:--
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MO3
1.sfumato
68
00:36.36
2.mediteran13
41
00:37.44
3.anonymous
14
00:54.23
4.bearn
55
01:03.49
5.morecookies
18
01:08.10
6.jeffafa
74
01:23.49
7.Bandit
41
01:29.42
8.Serpens Solidus
47
01:38.72
9.Ontwikseltsaar
36
01:39.31
10.Ramasp
91
01:45.24
AO5
1.mediteran13
41
00:40.04
2.sfumato
68
00:42.26
3.bearn
55
01:03.42
4.anonymous
14
01:22.05
5.morecookies
18
01:29.22
6.Bandit
41
01:30.12
7.Serpens Solidus
47
01:38.72
8.jeffafa
74
01:48.92
9.themathkid
32
01:49.72
10.Ontwikseltsaar
36
01:51.36
AO12
1.sfumato
68
01:12.52
2.Bandit
41
01:48.35
3.Serpens Solidus
47
02:02.47
4.Ontwikseltsaar
36
02:25.89
5.themathkid
32
02:32.74
6.Dunnowhattodo
54
03:04.72
7.SheaButter
20
03:45.40
8.AG721
24
03:52.16
9.anonymous
32
03:57.20
10.remark
103
04:23.44
Robots / programmatic solversinfo  
1.Charlie Li
60
00:00.521
2.nbjohnson00:00.843
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 16:20:12

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