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.mediteran13
28
00:01.89
2.sfumato
46
00:01.96
3.poepjes
12
00:02.23
4.markelobitx
31
00:02.33
5.Meep
75
00:02.60
6.Teal
50
00:02.76
7.reebz
59
00:02.77
8.Delabranche
31
00:03.50
9.million
26
00:03.73
10.MuratCT
11
00:03.97
11.CoBoMa00:04.38
12.Ben65732
67
00:04.40
13.AnthonyL
27
00:04.42
14.haveagooddavis00:04.63
15.bohemio1700:04.77
16.Hornlitz
17
00:04.93
17.TostiMaker
18
00:05.06
18.Andy100
37
00:05.10
19.jmp473
15
00:05.27
20.azubbang
10
00:05.31
This Week
1.mediteran13
28
00:01.89
2.sfumato
46
00:01.96
3.poepjes
12
00:02.45
4.reebz
59
00:03.02
5.MuratCT
11
00:03.97
6.Hornlitz
17
00:04.93
7.bohemio1700:05.10
8.HackMan00:06.25
9.Casper6600:07.33
10.Fastfaxer
53
00:07.90
11.cengizh00:08.42
12.Emma Selmeci
17
00:08.49
13.medusaworm00:09.35
14.s56squared00:09.87
15.HuaXi
11
00:10.11
16.ontheotherhand00:11.19
17.jfisher2
4
00:13.41
18.Kaitzschu
55
00:18.86
19.Oddverse00:22.73
20.Isis1900:31.49
Today
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MO3
1.sfumato
46
00:02.34
2.mediteran13
28
00:02.46
3.Half_Line
19
00:03.11
4.markelobitx
31
00:03.17
5.poepjes
12
00:03.53
6.Meep
75
00:03.58
7.reebz
59
00:03.63
8.kami
10
00:03.70
9.Illcat
13
00:04.21
10.bearn
53
00:04.27
AO5
1.mediteran13
28
00:02.50
2.sfumato
46
00:02.58
3.Half_Line
19
00:03.24
4.reebz
59
00:03.63
5.poepjes
12
00:03.83
6.markelobitx
31
00:03.85
7.bearn
53
00:04.01
8.Meep
75
00:04.13
9.Illcat
13
00:04.52
10.kami
10
00:04.92
AO12
1.mediteran13
28
00:03.08
2.sfumato
46
00:03.17
3.Half_Line
19
00:03.76
4.reebz
59
00:04.29
5.poepjes
12
00:04.32
6.bearn
53
00:04.66
7.markelobitx
31
00:05.24
8.Meep
75
00:05.37
9.Illcat
13
00:05.57
10.million
26
00:05.64
Robots / programmatic solversinfo  
1.nbjohnson00:00.40
2.Charlie Li
60
00:00.42
3.mediteran13
28
00:03.44

* 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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2021-06-22 00:29:11

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