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

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MO3
1. bearn
125
00:21.71
2. million
48
00:26.11
3. mediteran13
54
00:27.52
4. vowels
161
00:28.23
5. FAlin
138
00:30.64
6. EinsteinsBarber
88
00:35.00
7. Yoonseo Ha
30
00:39.15
8. sfumato
159
00:40.11
9. Andy100
80
00:45.74
10. qqwref
187
00:47.15
AO5
1. bearn
125
00:24.11
2. vowels
161
00:28.23
3. mediteran13
54
00:30.35
4. FAlin
138
00:35.09
5. million
48
00:36.08
6. EinsteinsBarber
88
00:40.42
7. sfumato
159
00:43.27
8. qqwref
187
00:51.95
9. Andy100
80
00:54.08
10. SliverHawk's sweethe...
120
00:56.67
AO12
1. bearn
125
00:33.09
2. FAlin
138
00:43.85
3. vowels
161
00:45.72
4. mediteran13
54
00:47.59
5. a979453451
125
01:07.32
6. EinsteinsBarber
88
01:08.20
7. million
48
01:12.96
8. Dunnowhattodo
128
01:15.21
9. suuperch
86
01:15.72
10. qqwref
187
01:16.25
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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2022-10-03 14:40:55

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