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. puzzleist
44
00:11.29
2. asdfhavcjklcjkl 00:12.30
3. miggy
68
00:14.52
4. kbdude8 00:27.76
5. Absofruitly 00:32.03
6. Xarpe
11
00:34.87
7. fishelstix 00:43.51
8. wam3988 00:44.81
9. MikeTysonReal 00:52.38
10. Septendecillion 00:56.88
11. kagury 00:59.05
12. Isley 01:05.40
13. Kenolo353
74
01:07.50
14. nnicciaa 01:17.43
15. Wandering 01:28.03
16. windex42
25
01:29.45
17. Gregory 01:37.68
18. greyscape
2
01:40.78
19. Dorice
190
01:56.93
20. platypuspen
8
06:50.09
This Week
1. asdfhavcjklcjkl 00:12.30
2. Absofruitly 00:32.03
3. Xarpe
11
00:34.87
4. wam3988 00:48.74
5. Kenolo353
74
01:24.70
6. greyscape
2
01:40.78
7. Nic0rasu 10:02.31
8. jtmcada
5
17:45.18
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MO3
1. vowels
200
00:07.31
2. bearn
185
00:07.84
3. haramey
152
00:08.87
4. mediteran13
54
00:09.65
5. Douglas Shamlin Jr.
524
00:10.02
6. sfumato
164
00:10.39
7. numbrr
200
00:12.29
8. BingBongBob
107
00:14.93
9. puzzleist
44
00:15.24
10. miggy
68
00:15.54
AO5
1. vowels
200
00:08.18
2. bearn
185
00:08.74
3. haramey
152
00:08.94
4. mediteran13
54
00:10.35
5. sfumato
164
00:10.64
6. Douglas Shamlin Jr.
524
00:10.79
7. numbrr
200
00:14.43
8. BingBongBob
107
00:15.81
9. puzzleist
44
00:16.03
10. BobTheJedi
56
00:16.11
AO12
1. bearn
185
00:10.51
2. vowels
200
00:11.05
3. haramey
152
00:11.93
4. Douglas Shamlin Jr.
524
00:13.44
5. sfumato
164
00:16.76
6. BingBongBob
107
00:18.84
7. numbrr
200
00:21.59
8. Fastfaxer
119
00:25.18
9. qqwref
258
00:25.93
10. miggy
68
00:28.05
Robots / programmatic solversinfo  
1.4s4f400:00.286
2.nbjohnson00:00.436
3.Charlie Li
61
00:00.446

* 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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2023-12-03 19:50:56

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