# 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.

Video Tutorial
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This Month
1. xXEZXx
7
00:01.61
70
00:01.86
3. Truth-or-Peace
101
00:02.46
4. CP2023 00:02.79
5. Solander
45
00:03.10
6. beatrixwashere
36
00:03.63
7. jmp473
53
00:03.66
8. Oryn
148
00:03.89
9. Ysuper
24
00:03.99
9. Cuber1cvc 00:03.99
11. thost 00:04.00
12. RelaxedCockatoo
56
00:04.10
13. MooKnight
35
00:04.24
14. Bhaygin 00:04.41
15. xetto
6
00:04.54
16. Manuel2 00:04.93
17. missPear
21
00:05.04
18. Zenobia
125
00:05.07
19. Sombro64 00:05.45
20. HackMan
68
00:05.46
This Week
70
00:01.86
2. CP2023 00:03.00
3. Cuber1cvc 00:03.99
4. thost 00:04.00
5. RelaxedCockatoo
56
00:04.14
6. Bhaygin 00:04.41
7. xetto
6
00:04.54
8. Zenobia
125
00:05.07
9. missPear
21
00:05.43
10. HackMan
68
00:05.46
11. Manuel2 00:05.78
12. UEPBFOM
1
00:05.94
13. Solander
45
00:06.36
14. Motivic
45
00:07.19
15. Sombro64 00:07.49
16. Trial 00:07.59
17. jeszon
55
00:07.91
18. ThighFish
19
00:07.99
19. Arjun US
5
00:08.81
20. burden42
49
00:12.47
Today
1. Zenobia
125
00:05.07
2. Sombro64 00:07.49
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MO3
1. vowels
202
00:01.35
2. Douglas Shamlin Jr.
617
00:01.45
3. nabi
92
00:01.64
4. haramey
188
00:01.70
5. BingBongBob
107
00:01.76
6. sfumato
164
00:01.78
7. jaybrainer
191
00:01.79
8. bearn
198
00:01.91
9. numbrr
244
00:02.17
10. jai22933
23
00:02.19
AO5
1. vowels
202
00:01.43
2. nabi
92
00:01.50
3. Douglas Shamlin Jr.
617
00:01.51
4. haramey
188
00:01.78
5. jaybrainer
191
00:01.79
6. BingBongBob
107
00:01.88
7. sfumato
164
00:01.89
8. bearn
198
00:01.93
9. jai22933
23
00:02.29
10. IHNN1
12
00:02.36
AO12
1. vowels
202
00:01.70
2. Douglas Shamlin Jr.
617
00:01.71
3. nabi
92
00:01.75
4. haramey
188
00:02.06
5. jaybrainer
191
00:02.21
6. bearn
198
00:02.24
7. BingBongBob
107
00:02.27
8. sfumato
164
00:02.29
9. jai22933
23
00:02.61
70
00:02.79
Robots / programmatic solversinfo
1.nbjohnson00:00.407
2.Charlie Li
61
00:00.420
3.俊杰_Charles
4
00:01.129

* 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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