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. haramey
58
00:24.45
2. Vincent615540 00:46.58
3. jiduoer 00:54.95
4. Solander 00:56.66
5. bundtcake
11
01:03.92
6. Dorice
169
01:13.15
7. BeccaWorm
43
01:19.83
8. Skallos
22
01:37.92
9. sredmond
54
01:40.16
10. da32s1da
15
01:48.50
11. limsh1201 4
50
01:48.56
12. fishysua
96
01:48.97
13. Kenolo353
57
02:17.20
14. BobTheJedi
30
03:09.65
15. Sherryksp
7
03:26.20
16. AbsInfini2022
10
04:22.49
17. Potatoman
1
05:58.09
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This Week
1. Vincent615540 00:46.58
2. sredmond
54
01:40.16
3. AbsInfini2022
10
04:22.49
4. Sherryksp
7
04:59.39
5. Potatoman
1
05:58.09
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MO3
1. bearn
139
00:14.14
2. Douglas Shamlin Jr.
457
00:15.89
3. mediteran13
54
00:16.12
4. sfumato
161
00:19.20
5. IHNN1
11
00:20.27
6. haramey
58
00:24.76
7. numbrr
152
00:25.30
8. EinsteinsBarber
101
00:29.91
9.anonymous
70
00:31.54
10. vowels
181
00:34.29
AO5
1. bearn
139
00:14.29
2. Douglas Shamlin Jr.
457
00:17.00
3. mediteran13
54
00:20.45
4. sfumato
161
00:21.11
5. IHNN1
11
00:24.92
6. haramey
58
00:27.36
7. numbrr
152
00:28.42
8. qqwref
230
00:34.31
9.anonymous
70
00:35.65
10. vowels
181
00:36.74
AO12
1. bearn
139
00:18.95
2. Douglas Shamlin Jr.
457
00:22.24
3. sfumato
161
00:28.16
4. numbrr
152
00:30.77
5. IHNN1
11
00:40.76
6. haramey
58
00:41.77
7.anonymous
70
00:42.55
8. vowels
181
00:53.41
9. Fastfaxer
117
00:54.06
10. qqwref
230
00:55.59
Robots / programmatic solversinfo
1.4s4f400:00.412
2.Charlie Li
60
00:00.473
3.nbjohnson00:00.639

* 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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