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
133
00:44.94
2. JaysKun 01:02.35
3. Onefivegoldfish 01:07.53
4. numbrr
142
01:09.28
5. mopon 01:16.97
6. A2Ragnell
16
01:41.20
7. tailor 01:52.54
8. Stemism
119
02:29.90
9. haramey
31
02:49.47
10. ShinsoBEAM 03:09.10
11. Tezexlo 03:46.36
12. MingQuk
1
04:49.99
13. s56squared 05:11.25
14. abo401
44
06:05.85
15. groel29
31
06:11.80
16. AlamMala
46
06:19.99
17. Paul Joseph Frigge
15
07:03.59
18. SeaSnailsShell
43
07:06.06
19. BeccaWorm
20
07:18.48
20. yosiaki
6
08:25.03
This Week
1. bearn
133
00:44.94
2. Stemism
119
02:39.72
3. haramey
31
02:49.47
4. ShinsoBEAM 03:55.49
5. groel29
31
06:11.80
6. Paul Joseph Frigge
15
07:03.59
7. BeccaWorm
20
07:18.48
8. yosiaki
6
08:25.03
9. issal 14:52.08
10. GageMath
13
16:10.32
11. xzaxzaazx
16
26:43.68
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Today
1. haramey
31
03:44.38
2. yosiaki
6
10:13.58
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4.--- empty -----:--
5.--- empty -----:--
6.--- empty -----:--
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MO3
1. bearn
133
00:48.52
2. Douglas Shamlin Jr.
444
01:32.36
3. numbrr
142
01:50.06
4. a979453451
127
02:11.63
5. Marjan2
12
02:20.37
6. schapel
22
02:21.52
7. Urban Fatur
71
02:27.57
8. Stemism
119
02:30.06
9. hasuu
44
02:36.82
10. sfumato
161
02:41.97
AO5
1. bearn
133
00:51.65
2. Douglas Shamlin Jr.
444
01:38.67
3. numbrr
142
02:08.64
4. a979453451
127
02:12.63
5. Marjan2
12
02:24.40
6. Urban Fatur
71
02:29.52
7. schapel
22
02:32.26
8. Stemism
119
02:36.81
9. hasuu
44
02:37.66
10. Dizmo12
80
02:47.75
AO12
1. bearn
133
00:55.33
2. Douglas Shamlin Jr.
444
02:11.52
3. a979453451
127
02:37.21
4. numbrr
142
02:39.43
5. supernoob
33
03:17.11
6. hasuu
44
03:17.83
7. Stemism
119
03:31.73
8. cc-drake
66
03:49.47
9. Dizmo12
80
03:49.48
10. AnthonyL
43
04:04.73
Robots / programmatic solversinfo  
1.4s4f400:00.464
2.Charlie Li
60
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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2023-01-28 05:55:06

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