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. Daheeamond
69
00:13.38
2. jamiecjx
62
00:19.91
3. 飞飞
35
00:32.61
4. kbdude8 00:53.15
5. ianspiv
38
00:54.32
6. LudvigL 00:59.30
7. Rickieman86 01:53.32
8. sronse 01:54.98
9. Dorice
209
02:03.44
10. Trichinclay
8
02:24.42
11. jasoncao1983 02:28.36
12. smonsta 02:35.04
13. Manuel2 02:43.89
14. NuriCorey 04:19.63
15. jdubs
114
04:58.39
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This Week
1. smonsta 02:35.04
2. sronse 03:25.11
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Today
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MO3
1. bearn
196
00:14.14
2. numbrr
240
00:15.13
3. vowels
202
00:15.28
4. Douglas Shamlin Jr.
599
00:15.89
5. mediteran13
54
00:16.12
6. haramey
185
00:16.24
7. Daheeamond
69
00:18.54
8. sfumato
164
00:19.20
9. IHNN1
12
00:20.27
10. miggy
100
00:24.51
AO5
1. bearn
196
00:14.29
2. vowels
202
00:15.91
3. haramey
185
00:16.88
4. Douglas Shamlin Jr.
599
00:17.00
5. numbrr
240
00:17.03
6. Daheeamond
69
00:20.39
7. mediteran13
54
00:20.45
8. sfumato
164
00:21.11
9. IHNN1
12
00:24.92
10. miggy
100
00:25.19
AO12
1. bearn
196
00:18.95
2. vowels
202
00:19.59
3. haramey
185
00:21.63
3. numbrr
240
00:21.63
5. Daheeamond
69
00:22.24
5. Douglas Shamlin Jr.
599
00:22.24
7. sfumato
164
00:28.16
8. miggy
100
00:28.56
9. BingBongBob
107
00:35.05
10. qqwref
259
00:37.11
Robots / programmatic solversinfo  
1.4s4f400:00.412
2.Charlie Li
61
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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2024-05-19 14:18:13

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