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. qqwref
249
00:12.00
2. bearn
159
00:12.54
3. haramey
92
00:15.62
4. TashiroMiraki
160
00:19.57
5. BingBongBob
99
00:23.81
6. BobTheJedi
49
00:33.81
7. nabifan
81
00:40.93
8. chiimo 00:46.21
9. s56squared 00:50.28
10. Dorice
177
01:04.99
11. fishysua
112
01:05.25
12. Xaspian 01:37.66
13. Evan12345 01:42.14
14. xilli 01:53.89
15. gaofeigou888
15
02:02.28
16. Trilogy 02:02.43
17. JDS42 02:18.21
18. creesa
23
02:26.53
19. jorah
57
03:26.95
20. bananaman7777777
8
03:37.49
This Week
1. qqwref
249
00:12.00
2. Dorice
177
01:34.69
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Today
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MO3
1. bearn
159
00:11.36
2. vowels
189
00:14.16
3. haramey
92
00:14.60
4. sfumato
163
00:15.09
5. Douglas Shamlin Jr.
472
00:16.12
6. qqwref
249
00:18.30
7. EinsteinsBarber
104
00:21.21
8. million
48
00:24.37
9. numbrr
163
00:25.21
10. nabifan
81
00:27.06
AO5
1. bearn
159
00:12.31
2. vowels
189
00:14.40
3. haramey
92
00:15.52
4. sfumato
163
00:15.75
5. Douglas Shamlin Jr.
472
00:16.60
6. qqwref
249
00:18.30
7. EinsteinsBarber
104
00:24.61
8. nabifan
81
00:27.58
9. BingBongBob
99
00:27.94
10. million
48
00:28.16
AO12
1. bearn
159
00:13.14
2. vowels
189
00:16.62
3. Douglas Shamlin Jr.
472
00:17.85
4. sfumato
163
00:19.30
5. haramey
92
00:19.50
6. qqwref
249
00:23.38
7. EinsteinsBarber
104
00:27.82
8. numbrr
163
00:31.79
9. BingBongBob
99
00:31.98
10. TashiroMiraki
160
00:35.10
Robots / programmatic solversinfo  
1.4s4f400:00.296
2.nbjohnson00:00.421
3.Charlie Li
60
00:00.433

* 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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2023-06-05 06:28:32

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