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. jamiecjx
53
00:17.08
2. kbdude8 00:32.57
3. Solander
42
00:38.47
4. Dorice
205
00:40.71
5. LudvigL 00:57.20
6. Son2006 01:02.25
7. ScreenName23
18
01:10.47
8. Dicko-san
94
01:11.88
9. sronse 01:23.16
10. windex42
27
01:29.45
11. 月下云茵
15
01:50.97
12. tty00712 02:08.54
13. balzi 02:08.84
14. Grymhar 02:17.27
15. lepetitgenie 02:49.89
16. monsieurM1 05:06.49
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This Week
1. jamiecjx
53
00:17.08
2. LudvigL 00:57.20
3. Son2006 01:02.25
4. ScreenName23
18
01:10.47
5. Dicko-san
94
01:11.88
6. windex42
27
01:29.45
7. balzi 02:08.84
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Today
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MO3
1. vowels
202
00:07.31
2. bearn
195
00:07.84
3. haramey
180
00:08.87
4. mediteran13
54
00:09.65
5. numbrr
232
00:09.74
6. Douglas Shamlin Jr.
575
00:10.02
7. sfumato
164
00:10.39
8. Daheeamond
67
00:11.59
9. miggy
98
00:14.73
10. BingBongBob
107
00:14.93
AO5
1. vowels
202
00:08.18
2. bearn
195
00:08.74
3. haramey
180
00:08.94
4. mediteran13
54
00:10.35
5. numbrr
232
00:10.46
6. sfumato
164
00:10.64
7. Douglas Shamlin Jr.
575
00:10.79
8. Daheeamond
67
00:12.66
9. BingBongBob
107
00:15.81
10. BobTheJedi
56
00:16.11
AO12
1. bearn
195
00:10.51
2. vowels
202
00:11.05
3. haramey
180
00:11.93
4. Douglas Shamlin Jr.
575
00:13.44
5. numbrr
232
00:13.46
6. sfumato
164
00:16.76
7. Daheeamond
67
00:17.05
8. BingBongBob
107
00:18.84
9. miggy
98
00:18.90
10. Fastfaxer
124
00:25.18
Robots / programmatic solversinfo  
1.4s4f400:00.286
2.nbjohnson00:00.436
3.Charlie Li
61
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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2024-04-18 09:56:15

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