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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Nurikabe


5x5 Easy Nurikabe | 5x5 Hard Nurikabe | 7x7 Easy Nurikabe | 7x7 Hard Nurikabe | 10x10 Easy Nurikabe | 10x10 Hard Nurikabe | 12x12 Easy Nurikabe | 12x12 Hard Nurikabe | 15x15 Easy Nurikabe | 15x15 Hard Nurikabe | 20x20 Easy Nurikabe

This Month
1. ⒺⒿⒸⓈⒹ
20
00:01.19
1. xXEZXx
7
00:01.19
3. ML555
7
00:01.30
4. Void Cat
1
00:02.06
5. A2Ragnell
17
00:02.39
6. puzzleist
61
00:02.53
7. BobTheJedi
56
00:02.80
8. CP2023 00:02.84
9. Xarpe
21
00:02.91
10. Truth-or-Peace
83
00:02.98
11. FriedSquid 00:03.70
12. eitan 00:03.93
13. RelaxedCockatoo
55
00:04.01
14. GoldChoco36
90
00:04.25
15. Fjznbeinfnn 00:04.39
16. Einsteinus
93
00:04.87
17. mathandplants 00:04.95
18. ly7y
6
00:05.31
19. inshiel 00:05.84
20. Grymhar 00:06.04
This Week
1. puzzleist
61
00:02.53
2. CP2023 00:02.86
3. Einsteinus
93
00:04.87
4. ly7y
6
00:05.31
5. JetpackBatman
13
00:06.50
6. matsagad
13
00:07.41
7. jeszon
53
00:09.81
8. picarat
42
00:12.20
9. gaphodil
3
00:14.04
10. Manuel2 00:16.89
11. Klaudia
4
00:17.61
12. MisterBarbarian 00:19.56
13. UEPBFOM
1
00:19.65
14. June Mail
21
00:20.82
15. yirenguihua 00:29.70
16. MarumarumaruKado
10
01:59.92
17. Xarpe
21
6d 17:48:51.30
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Today
1. puzzleist
61
00:02.53
2.--- empty -----:--
3.--- empty -----:--
4.--- empty -----:--
5.--- empty -----:--
6.--- empty -----:--
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MO3
1. vowels
202
00:01.35
2. Douglas Shamlin Jr.
543
00:01.45
3. nabi
92
00:01.64
4. haramey
171
00:01.70
5. BingBongBob
107
00:01.76
6. sfumato
164
00:01.78
7. jaybrainer
175
00:01.83
8. bearn
194
00:01.91
9. jai22933
23
00:02.19
10. IHNN1
12
00:02.28
AO5
1. vowels
202
00:01.43
2. nabi
92
00:01.50
3. Douglas Shamlin Jr.
543
00:01.51
4. haramey
171
00:01.78
5. jaybrainer
175
00:01.79
6. BingBongBob
107
00:01.88
7. sfumato
164
00:01.89
8. bearn
194
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.
543
00:01.71
3. nabi
92
00:01.75
4. haramey
171
00:02.06
5. bearn
194
00:02.24
6. BingBongBob
107
00:02.27
7. sfumato
164
00:02.29
8. jaybrainer
175
00:02.32
9. jai22933
23
00:02.61
10. qqwref
259
00:02.83
Robots / programmatic solversinfo  
1.nbjohnson00:00.407
2.Charlie Li
61
00:00.420
3.mediteran13
54
00:03.440

* 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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2024-02-21 10:25:20

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