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. A2Ragnell 01:04.75
2. NoahR
166
01:09.93
3. Dunnowhattodo
111
01:16.07
4. danmun 01:22.90
5. themathkid
43
01:42.05
6. Dan380 01:55.04
7. LINK3
9
01:58.37
8. Busumgenas
26
01:59.20
9. sredmond
26
02:03.70
10. Solander 02:04.36
11. XMUYMZ 02:19.69
12. pknfw 02:20.59
13. JohnnyB 02:30.97
14. muse317
10
02:38.91
15. Dorice
123
02:40.02
16. mopon 02:42.04
17. Kuruwa
35
02:46.10
18. brac37 02:46.12
19. Thrillhou 02:49.87
20. AsBefore 03:03.45
This Week
1. A2Ragnell 01:04.75
2. Dunnowhattodo
111
01:16.07
3. JohnnyB 02:35.55
4. Dorice
123
02:40.02
5. brac37 02:46.12
6. Dan380 02:56.68
7. Stacey1983 03:11.82
8. Raphit
9
04:38.09
9. Nanli 06:07.60
10. NZjazzman 08:37.12
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Today
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MO3
1. bearn
107
00:24.83
2. sfumato
144
00:33.67
3. Douglas Shamlin Jr.
383
00:35.78
4. mediteran13
54
00:37.44
5.anonymous
44
00:50.24
6. numbrr
98
01:03.95
7. morecookies
18
01:08.10
8. Fastfaxer
115
01:11.56
9. Dunnowhattodo
111
01:16.08
10. RooSTeR
75
01:19.33
AO5
1. bearn
107
00:27.47
2. Douglas Shamlin Jr.
383
00:38.99
3. sfumato
144
00:39.00
4. mediteran13
54
00:40.05
5.anonymous
44
00:52.12
6. Fastfaxer
115
01:17.38
7. numbrr
98
01:18.90
8. Dunnowhattodo
111
01:19.58
9. RooSTeR
75
01:22.63
10. morecookies
18
01:29.22
AO12
1. bearn
107
00:35.38
2. Douglas Shamlin Jr.
383
00:47.20
3. sfumato
144
00:53.19
4.anonymous
44
00:59.21
5. Dunnowhattodo
111
01:24.22
6. Fastfaxer
115
01:36.88
7. RooSTeR
75
01:38.42
8. numbrr
98
01:46.22
9. Bandit
65
01:48.35
10. themathkid
43
01:56.58
Robots / programmatic solversinfo  
1.Charlie Li
60
00:00.521
2.nbjohnson00:00.843
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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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2022-05-26 01:22:31

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