# 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. bearn
159
00:08.70
2. haramey
92
00:09.69
3. qqwref
249
00:12.72
4. BobTheJedi
49
00:13.70
5. BingBongBob
99
00:20.47
6. sredmond
59
00:25.24
7. loganmcbroom 00:29.00
8. Dorice
177
00:31.23
9. Opsosaurus
35
00:36.18
10. rodpodd 00:42.87
11. Migster27 00:46.62
12. kropki
18
00:48.23
13. leftq 00:49.50
14. Gosselyn777 00:55.15
15. Hyrule 00:56.20
16. Xaspian 00:56.35
17. joshdl 01:01.30
18. fishysua
112
01:02.02
19. Uri Gotman
48
01:07.75
20. xilli 01:13.95
This Week
1. qqwref
249
00:12.72
2. BobTheJedi
49
00:13.70
3. loganmcbroom 00:29.00
4. Dorice
177
00:42.37
5. rodpodd 00:42.87
6. Migster27 00:46.62
7. joshdl 01:01.30
8. xilli 01:14.25
9. sronse 01:30.70
10. cae_prince
24
02:06.36
11. Jovess 02:10.30
12. raelkid
53
02:40.49
13. xiven77
29
03:23.56
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Today
1. sronse 01:46.33
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MO3
1. bearn
159
00:07.84
2. mediteran13
54
00:09.65
3. Douglas Shamlin Jr.
472
00:10.02
4. sfumato
163
00:10.39
5. haramey
92
00:10.61
6. vowels
189
00:12.75
7. nabifan
81
00:17.00
8. qqwref
249
00:17.69
9. Fastfaxer
117
00:18.55
10. numbrr
163
00:18.58
AO5
1. bearn
159
00:08.74
2. mediteran13
54
00:10.35
3. sfumato
163
00:10.64
4. Douglas Shamlin Jr.
472
00:10.79
5. haramey
92
00:11.20
6. vowels
189
00:12.91
7. nabifan
81
00:18.82
8. BingBongBob
99
00:19.03
9. numbrr
163
00:19.69
10. Fastfaxer
117
00:20.72
AO12
1. bearn
159
00:11.30
2. Douglas Shamlin Jr.
472
00:13.62
3. vowels
189
00:14.19
4. haramey
92
00:16.12
5. sfumato
163
00:16.76
6. BingBongBob
99
00:24.88
7. Fastfaxer
117
00:25.18
8. numbrr
163
00:25.51
9. qqwref
249
00:25.93
10. TashiroMiraki
160
00:28.42
Robots / programmatic solversinfo
1.4s4f400:00.286
2.nbjohnson00:00.436
3.Charlie Li
60
00:00.446

* 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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