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. bearn
195
00:36.52
2. miggy
98
00:38.76
3. JaysKun 00:56.77
4. numbrr
232
00:57.37
5. mopon 01:04.21
6. Daheeamond
67
01:45.27
7. erichiro 02:11.69
8. Thrillhousr847 02:22.58
9. oddsocks 02:39.16
10. SHIN LEECHEOL
34
02:47.51
11. jamiecjx
53
02:49.53
12. wam3988 02:53.19
13. wiglicker 03:11.53
14. bearjason 03:15.15
15. GlennCRhoads 03:20.88
16. RelaxedCockatoo
55
03:35.40
17. Dorice
205
03:35.49
18. Speedygonzales 04:28.33
19. matsagad
18
04:41.47
20. LightPaladin07
25
04:42.55
This Week
1. miggy
98
00:38.87
2. SHIN LEECHEOL
34
02:47.51
3. wiglicker 03:11.53
4. GlennCRhoads 03:39.05
5. bearjason 04:12.01
6. Speedygonzales 04:28.33
7. matsagad
18
04:41.47
8. ALXDR 04:43.85
9. RelaxedCockatoo
55
05:26.45
10. Hartjess 05:52.44
11. missPear 05:55.12
12. slyguy519
34
08:49.48
13. darthV
21
10:49.72
14. TheCrazyCat 15:12.57
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Today
1. miggy
98
00:40.56
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3.--- empty -----:--
4.--- empty -----:--
5.--- empty -----:--
6.--- empty -----:--
7.--- empty -----:--
8.--- empty -----:--
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MO3
1. bearn
195
00:35.53
2. miggy
98
00:42.07
3. haramey
180
00:50.97
4. vowels
202
01:01.77
5. numbrr
232
01:11.59
6. A2Ragnell
17
01:29.82
7. Douglas Shamlin Jr.
575
01:32.36
8. Daheeamond
67
01:47.81
9. schapel
38
02:10.13
10. a979453451
158
02:11.63
AO5
1. bearn
195
00:37.23
2. miggy
98
00:43.55
3. haramey
180
00:52.80
4. vowels
202
01:05.00
5. numbrr
232
01:06.60
6. Douglas Shamlin Jr.
575
01:38.67
7. A2Ragnell
17
01:49.43
8. Daheeamond
67
01:50.49
9. a979453451
158
02:12.63
10. XantheneL
45
02:15.51
AO12
1. bearn
195
00:40.26
2. miggy
98
00:47.51
3. haramey
180
00:56.31
4. vowels
202
01:13.23
5. numbrr
232
01:24.63
6. Douglas Shamlin Jr.
575
02:11.52
7. a979453451
158
02:35.70
8. XantheneL
45
02:36.29
9. Daheeamond
67
02:38.72
10. Dizmo12
104
02:57.27
Robots / programmatic solversinfo  
1.4s4f400:00.464
2.Charlie Li
61
00:00.518
3.nbjohnson00:00.691

* 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 09:46:03

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