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 Easy Nurikabe | 5x5 Hard Nurikabe | 7x7 Easy Nurikabe | 7x7 Hard Nurikabe | 10x10 Easy Nurikabe | 10x10 Hard Nurikabe | 12x12 Easy Nurikabe | 12x12 Hard Nurikabe | 15x15 Easy Nurikabe | 15x15 Hard Nurikabe | 20x20 Easy Nurikabe

This Month
1. kbdude8 00:24.11
2. Solander 00:30.07
3. AndrewTeng00729
3
00:34.14
4. ypw19
30
00:39.95
5. Dorice
154
00:42.61
6. Lillipup 00:49.85
7. bundtcake
4
00:53.09
8. toaster611
39
01:07.34
9. xiangongzhidao
27
01:10.46
10. joshdl 01:12.78
11. Whale
1
01:27.05
12. eonhochang
34
01:29.57
13. Dusty82 02:01.62
14. Uri Gotman
47
02:49.06
15. GageMath
13
06:26.58
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This Week
1. Dorice
154
00:42.61
2. xiangongzhidao
27
01:10.46
3. joshdl 01:38.81
4. Dusty82 02:54.04
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Today
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MO3
1. bearn
133
00:08.80
2. mediteran13
54
00:09.65
3. sfumato
161
00:10.39
4. Douglas Shamlin Jr.
444
00:12.22
5. vowels
175
00:13.95
6. Fastfaxer
117
00:18.55
7. numbrr
142
00:18.58
8. Make
177
00:21.16
9. EinsteinsBarber
99
00:23.01
10. jaybrainer
103
00:25.33
AO5
1. bearn
133
00:08.90
2. mediteran13
54
00:10.35
3. sfumato
161
00:10.64
4. Douglas Shamlin Jr.
444
00:11.96
5. vowels
175
00:15.84
6. numbrr
142
00:19.69
7. Fastfaxer
117
00:20.72
8. Make
177
00:22.24
9. EinsteinsBarber
99
00:25.09
10. qqwref
225
00:27.44
AO12
1. bearn
133
00:11.99
2. Douglas Shamlin Jr.
444
00:15.56
3. sfumato
161
00:16.76
4. vowels
175
00:23.32
5. Fastfaxer
117
00:25.18
6. numbrr
142
00:25.51
7. Make
177
00:33.93
8. jaybrainer
103
00:36.27
9. NoahR
197
00:36.61
10. arcer
86
00:37.61
Robots / programmatic solversinfo  
1.4s4f400:00.286
2.nbjohnson00:00.436
3.Charlie Li
60
00:00.446

* 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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2023-01-28 06:04:39

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