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
00:29.02
2. jamiecjx
62
00:39.23
3. Solander
44
01:11.58
4. danmun 01:14.35
5. 飞飞
35
01:16.13
6. OmegaRidley
38
01:24.80
7. KimsterH 01:35.02
8. SheaButter
56
01:38.89
9. Dan380 01:39.94
10. BlackCat99
49
01:41.90
11. Thrillhou 01:43.44
12. John9439
101
01:43.67
13. yuragi 01:44.94
14. JohnnyB 01:56.01
15. AG721
97
02:01.91
16. Elvenphox
34
02:04.19
17. JOJOOOOOO
48
02:05.96
18. Dorice
209
02:06.13
19. Pengui
16
02:13.28
20. maciao4515 02:20.43
This Week
1. jamiecjx
62
00:39.23
2. danmun 01:14.35
3. SheaButter
56
01:38.89
4. Thrillhou 01:43.44
5. Solander
44
01:44.54
6. yuragi 01:44.94
7. KimsterH 01:45.70
8. John9439
101
01:45.81
9. Dan380 01:56.27
10. BlackCat99
49
01:57.52
11. Pengui
16
02:13.28
12. maciao4515 02:20.43
13. JohnnyB 02:35.94
14. JustDave 02:41.48
15. JorgeV 02:46.46
16. Cori83 06:00.73
17. Joris Brouwer
25
07:07.24
18. bathroom spider
17
12:55.94
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Today
1. jamiecjx
62
00:39.23
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6.--- empty -----:--
7.--- empty -----:--
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MO3
1. bearn
196
00:22.16
2. numbrr
240
00:29.41
3. haramey
185
00:31.17
4. vowels
202
00:31.80
5. sfumato
164
00:33.67
6. Daheeamond
69
00:34.88
7. Douglas Shamlin Jr.
599
00:35.78
8. mediteran13
54
00:37.44
9. miggy
100
00:40.34
10. A2Ragnell
17
00:44.79
AO5
1. bearn
196
00:23.48
2. numbrr
240
00:31.15
3. vowels
202
00:35.13
4. haramey
185
00:37.08
5. Douglas Shamlin Jr.
599
00:38.99
6. Daheeamond
69
00:39.00
6. sfumato
164
00:39.00
8. mediteran13
54
00:40.05
9. miggy
100
00:45.96
10. A2Ragnell
17
00:47.69
AO12
1. bearn
196
00:28.93
2. vowels
202
00:39.14
3. numbrr
240
00:39.38
4. haramey
185
00:42.44
5. Douglas Shamlin Jr.
599
00:47.20
6. Daheeamond
69
00:49.04
7. sfumato
164
00:53.19
8. A2Ragnell
17
00:53.52
9.anonymous
93
00:59.21
10. miggy
100
01:00.64
Robots / programmatic solversinfo  
1.Charlie Li
61
00:00.521
2.4s4f400:00.574
3.nbjohnson00:00.843

* 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 13:57:29

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