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 Nurikabe Easy | 5x5 Nurikabe Hard | 7x7 Nurikabe Easy | 7x7 Nurikabe Hard | 10x10 Nurikabe Easy | 10x10 Nurikabe Hard | 12x12 Nurikabe Easy | 12x12 Nurikabe Hard | 15x15 Nurikabe Easy | 15x15 Nurikabe Hard | 20x20 Nurikabe Easy

This Month
1. bearn
125
00:56.83
2. JaysKun 01:03.11
3. mopon 01:17.23
4. tailor 01:43.20
5. A2Ragnell
5
02:04.75
6. tiramasu 02:39.83
7. crystalink 02:51.07
8. etheerio 02:53.44
9. RelaxedCockatoo
53
03:03.21
10. South8 03:11.11
11. Dorice
136
03:19.48
12. wiglicker 03:28.91
13. Chronodrax
32
03:38.48
14. HackMan
24
03:50.72
15. toaster611
29
04:10.80
16. ElvisLives 04:17.72
17. s56squared 04:36.90
18. nrtz
73
05:13.87
19. jlwill 05:19.18
20. froz3n_
46
05:37.26
This Week
1. bearn
125
00:56.83
2. crystalink 02:51.07
3. South8 03:11.11
4. Dorice
136
03:19.48
5. nrtz
73
05:13.87
6. jlwill 05:19.18
7. froz3n_
46
05:37.26
8. Cancara 05:46.55
9. Michelins
21
06:13.81
10. s56squared 07:17.06
11. Green Gee
1
10:56.64
12. topaz
25
57:03.15
13.--- empty -----:--
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Today
1. South8 03:11.11
2. Michelins
21
06:13.81
3. nrtz
73
08:32.86
4.--- empty -----:--
5.--- empty -----:--
6.--- empty -----:--
7.--- empty -----:--
8.--- empty -----:--
9.--- empty -----:--
10.--- empty -----:--
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
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MO3
1. bearn
125
01:00.80
2. Douglas Shamlin Jr.
422
01:32.36
3. a979453451
125
02:11.63
4. Marjan2
12
02:20.37
5. schapel
22
02:21.52
6. Stemism
109
02:30.06
7. Urban Fatur
67
02:30.28
8. sfumato
159
02:41.97
9. hasuu
39
02:44.07
10. supernoob
30
02:44.24
AO5
1. bearn
125
01:07.20
2. Douglas Shamlin Jr.
422
01:38.67
3. a979453451
125
02:12.63
4. Marjan2
12
02:24.40
5. Urban Fatur
67
02:29.52
6. schapel
22
02:32.26
7. Stemism
109
02:36.81
8. Dizmo12
75
02:47.75
9. supernoob
30
02:55.19
10. hasuu
39
02:57.73
AO12
1. bearn
125
01:20.47
2. Douglas Shamlin Jr.
422
02:11.52
3. a979453451
125
02:37.21
4. supernoob
30
03:17.11
5. Stemism
109
03:31.73
6. Dizmo12
75
03:49.48
7. AnthonyL
43
04:04.73
8. Fastfaxer
117
04:12.82
9. NoahR
180
04:14.19
10. Urban Fatur
67
04:26.33
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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2022-10-03 13:43:58

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