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. CoBoMa 00:06.47
2. toaster611
29
00:08.81
3. ZeX420 00:09.46
4. jmp473
41
00:09.58
5. afidaleo
69
00:11.80
6. JuarTM
3
00:12.14
7. s56squared 00:12.26
8. HackMan
24
00:12.81
9. fffinch 00:13.52
10. Dorice
136
00:17.92
11. leonleonidis
13
00:18.35
12. medusaworm 00:18.54
13. Uthor 00:21.47
14. concentration 00:29.04
15. ambiorix 00:35.63
16. PsychoClaw
4
01:07.18
17. liyan
50
01:13.21
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This Week
1. toaster611
29
00:08.81
2. s56squared 00:18.59
3. medusaworm 00:18.70
4. concentration 00:29.04
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Today
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MO3
1. bearn
125
00:03.53
2. vowels
161
00:03.69
3. sfumato
159
00:03.86
4. Douglas Shamlin Jr.
422
00:04.10
5. mediteran13
54
00:04.95
6. numbrr
126
00:05.13
7. Fastfaxer
117
00:05.76
8. soy
76
00:05.99
9. reebz
65
00:06.51
10. nabifan
57
00:06.82
AO5
1. bearn
125
00:03.63
2. vowels
161
00:03.76
3. sfumato
159
00:04.09
4. Douglas Shamlin Jr.
422
00:04.28
5. numbrr
126
00:05.46
6. mediteran13
54
00:05.62
7. soy
76
00:06.52
8. Fastfaxer
117
00:06.75
9. million
48
00:07.00
10. reebz
65
00:07.04
AO12
1. bearn
125
00:04.22
2. Douglas Shamlin Jr.
422
00:04.41
3. sfumato
159
00:04.68
4. vowels
161
00:05.08
5. mediteran13
54
00:06.09
6. numbrr
126
00:06.62
7. Fastfaxer
117
00:07.38
8. soy
76
00:08.12
9. million
48
00:08.28
10. reebz
65
00:08.41
Robots / programmatic solversinfo  
1.Charlie Li
60
00:00.412
2.nbjohnson00:00.475
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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 14:19:01

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