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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This Month
1. thost 00:07.75
2. jmp473
53
00:10.43
3. Manuel2 00:12.34
4. HackMan
68
00:12.75
5. missPear
21
00:19.62
6. choroba 00:29.29
7. MooKnight
35
00:32.30
8. jdbtwo 00:32.53
9. MishaVargas
1
00:41.24
10. aeusuke 00:46.48
11. smonsta 00:47.58
12. puzzlewizz
61
00:55.08
13. nanu2024 01:04.01
14. Arthur Docteur Mulle...
5
01:36.23
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This Week
1. thost 00:07.84
2. HackMan
68
00:12.75
3. missPear
21
00:19.62
4. jdbtwo 01:02.60
5. nanu2024 01:04.01
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MO3
1. vowels
202
00:02.67
2. nabi
92
00:02.93
3. bearn
198
00:03.55
4. haramey
188
00:03.66
5. Douglas Shamlin Jr.
617
00:03.75
6. sfumato
164
00:03.91
7. BingBongBob
107
00:04.01
8. jaybrainer
191
00:04.47
70
00:04.53
10. qqwref
259
00:04.58
AO5
1. vowels
202
00:02.87
2. nabi
92
00:02.93
3. Douglas Shamlin Jr.
617
00:03.80
4. bearn
198
00:03.82
5. haramey
188
00:03.88
6. BingBongBob
107
00:04.07
7. jaybrainer
191
00:04.47
8. sfumato
164
00:04.71
70
00:04.78
10. numbrr
244
00:04.85
AO12
1. vowels
202
00:03.82
2. Douglas Shamlin Jr.
617
00:04.08
3. nabi
92
00:04.11
4. bearn
198
00:04.17
5. haramey
188
00:04.73
6. BingBongBob
107
00:04.99
7. sfumato
164
00:05.23
8. numbrr
244
00:05.38
9. jaybrainer
191
00:05.64
70
00:05.72
Robots / programmatic solversinfo
1.4s4f400:00.255
2.nbjohnson00:00.416
3.Charlie Li
61
00:00.417

* 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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