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. miggy
104
00:40.05
2. JaysKun 00:53.58
3. asdfhavcjklcjkl 00:59.46
4. A2Ragnell
17
01:13.09
5. tailor 01:41.08
6. K-NURIKABE
81
01:49.98
7. kbdude8 02:06.38
8. oddsocks 02:35.84
9. bearjason 02:50.56
11. AgnieszkaNesa
42
03:17.76
12. hiptopoker 03:24.42
13. Manuel2 03:54.58
14. JustDave 03:57.99
15. Koakuma
41
04:08.29
16. jdubs
118
04:37.72
17. CakeCheese 05:12.45
18. yosiaki
72
05:13.14
19. grz142857 05:26.01
20. Tezexlo
45
06:04.35
This Week
1. asdfhavcjklcjkl 01:16.07
2. oddsocks 02:35.84
3. bearjason 02:50.56
4. AgnieszkaNesa
42
03:17.76
5. hiptopoker 03:24.42
7. Koakuma
41
04:08.29
8. jdubs
118
04:37.72
9. grz142857 05:26.01
10. Tiyain 09:19.82
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Today
1. AgnieszkaNesa
42
03:17.76
2. bearjason 03:18.58
4. jdubs
118
04:37.72
5. Tiyain 09:19.82
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MO3
1. bearn
198
00:35.53
2. miggy
104
00:42.07
3. haramey
196
00:50.97
4. vowels
211
01:01.77
5. numbrr
252
01:08.37
6. K-NURIKABE
81
01:25.97
7. A2Ragnell
17
01:29.82
8. Douglas Shamlin Jr.
638
01:32.36
9. schapel
38
02:10.13
10. a979453451
166
02:11.63
AO5
1. bearn
198
00:37.23
2. miggy
104
00:43.55
3. haramey
196
00:52.80
4. vowels
211
01:05.00
5. numbrr
252
01:06.60
6. K-NURIKABE
81
01:27.15
7. Douglas Shamlin Jr.
638
01:38.67
8. A2Ragnell
17
01:49.43
9. a979453451
166
02:12.63
10. XantheneL
45
02:15.51
AO12
1. bearn
198
00:40.26
2. miggy
104
00:47.51
3. haramey
196
00:56.31
4. vowels
211
01:13.23
5. numbrr
252
01:21.73
6. K-NURIKABE
81
01:43.30
7. Douglas Shamlin Jr.
638
02:11.52
8. a979453451
166
02:34.02
9. XantheneL
45
02:36.29
10. Dizmo12
108
02:57.27
Robots / programmatic solversinfo
1.4s4f400:00.464
2.Charlie Li
61
00:00.518
3.nbjohnson00:00.691

* 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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