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. bearn
125
00:21.37
2. A2Ragnell
5
00:34.56
3. vowels
161
00:49.70
4. Dunnowhattodo
128
01:04.89
5. Jequiyot 01:20.97
6. 8bit
26
01:29.05
7. ibieiniid 01:41.13
8. leftq 01:46.91
9. Thrillhou 01:49.07
10. Oc
35
01:49.78
11. eitan 01:54.17
12. Dan380 02:01.34
13. icecreammac
70
02:17.32
14. HackMan
24
02:18.82
15. Raphit
23
02:44.24
16. JohnnyB 03:01.88
17. Dorice
136
03:32.16
18. toaster611
29
03:45.38
19. ElvisLives 04:16.83
20. lechatnoir7
4
04:33.67
This Week
1. A2Ragnell
5
00:38.72
2. vowels
161
00:49.70
3. Dunnowhattodo
128
01:04.89
4. leftq 01:46.91
5. icecreammac
70
02:17.32
6. Dan380 02:25.77
7. nrtz
73
04:40.45
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MO3
1. bearn
125
00:24.83
2. sfumato
159
00:33.67
3. Douglas Shamlin Jr.
422
00:35.78
4. mediteran13
54
00:37.44
5.anonymous
55
00:50.24
6. A2Ragnell
5
01:03.30
7. numbrr
126
01:03.95
8. morecookies
18
01:08.10
9. Dunnowhattodo
128
01:08.31
10. RooSTeR
92
01:09.36
AO5
1. bearn
125
00:27.47
2. Douglas Shamlin Jr.
422
00:38.99
3. sfumato
159
00:39.00
4. mediteran13
54
00:40.05
5.anonymous
55
00:52.12
6. RooSTeR
92
01:09.36
7. Dunnowhattodo
128
01:09.73
8. Fastfaxer
117
01:17.38
9. numbrr
126
01:18.90
10. Bandit
72
01:28.24
AO12
1. bearn
125
00:35.38
2. Douglas Shamlin Jr.
422
00:47.20
3. sfumato
159
00:53.19
4.anonymous
55
00:59.21
5. Dunnowhattodo
128
01:24.22
6. RooSTeR
92
01:26.61
7. Fastfaxer
117
01:36.88
8. numbrr
126
01:46.22
9. Bandit
72
01:48.35
10. themathkid
46
01:56.58
Robots / programmatic solversinfo  
1.Charlie Li
60
00:00.521
2.4s4f400:00.574
3.nbjohnson00:00.843

* 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 14:14:00

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