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
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MO3
1.million
47
00:26.11
2.mediteran13
53
00:27.52
3.FAlin
123
00:30.64
4.bearn
64
00:32.58
5.sfumato
98
00:40.11
6.EinsteinsBarber
47
00:40.85
7.Andy100
55
00:45.74
8.SilverHawk
56
00:47.72
9.Luisma Suarez Menendez
51
00:58.54
10.arcer
65
00:58.86
AO5
1.mediteran13
53
00:30.35
2.bearn
64
00:32.58
3.FAlin
123
00:35.26
4.million
47
00:36.08
5.sfumato
98
00:43.27
6.EinsteinsBarber
47
00:50.63
7.Andy100
55
00:54.08
8.SilverHawk
56
00:56.67
9.Luisma Suarez Menendez
51
01:05.27
10.a979453451
97
01:11.54
AO12
1.bearn
64
00:42.91
2.FAlin
123
00:43.85
3.mediteran13
53
00:47.59
4.million
47
01:12.96
5.Andy100
55
01:22.27
6.a979453451
97
01:24.54
7.suuperch
68
01:41.91
8.Bandit
44
01:51.46
9.arcer
65
01:52.07
10.mslamhoa
153
01:52.95
Robots / programmatic solversinfo  
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* 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 09:47:02

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