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. miggy
127
00:37.00
2. asdfhavcjklcjkl 00:38.93
3. Min._.下(KR)
97
00:47.30
4. JaysKun 00:56.39
5. Jovess 01:33.06
6. kbdude8 02:00.88
7. JeremyWu 02:02.61
8. erichiro 02:15.50
9. wam3988 02:36.32
10. AlexanderH 02:51.47
11. 222champ 02:52.39
12. Elias Westerbergh
60
02:58.39
13. ALXDR 03:01.29
14. bearjason 03:07.83
15. hiptopoker 03:38.99
16. HackMan
105
03:39.79
17. 리링
79
03:40.04
18. chiimo 03:43.38
19. AgnieszkaNesa
96
03:56.01
20. Dorice
242
04:03.17
This Week
1. miggy
127
00:37.86
2. asdfhavcjklcjkl 00:42.04
3. Min._.下(KR)
97
00:47.30
4. Jovess 01:36.91
5. JeremyWu 02:02.61
6. Dorice
242
04:03.17
7. Harry_Canyon
126
04:09.00
8. HackMan
105
04:10.80
9. AiTug
15
04:23.66
10. Skemmer 04:38.13
11. Павел Гарм...
22
04:49.78
12. TJ11235
8
08:11.48
13. Gawin Pukchareon
26
10:19.11
14. FunAcroFly
67
15:42.69
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Today
1. JeremyWu 02:04.79
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MO3
1. bearn
206
00:35.53
2. numbrr
297
00:36.49
3. miggy
127
00:37.97
4. haramey
230
00:50.97
5. Min._.下(KR)
97
00:55.18
6. vowels
216
01:01.77
7. A2Ragnell
17
01:29.82
8. Douglas Shamlin Jr.
692
01:32.36
9. COlDAiR
63
01:45.15
10. daanbe
215
01:52.10
AO5
1. bearn
206
00:37.11
2. miggy
127
00:39.00
3. numbrr
297
00:39.71
4. haramey
230
00:52.80
5. Min._.下(KR)
97
00:59.05
6. vowels
216
01:05.00
7. Douglas Shamlin Jr.
692
01:38.67
8. A2Ragnell
17
01:49.43
9. COlDAiR
63
01:49.85
10. daanbe
215
01:57.59
AO12
1. bearn
206
00:40.26
2. miggy
127
00:41.98
3. haramey
230
00:56.31
4. numbrr
297
00:56.83
5. Min._.下(KR)
97
01:06.96
6. vowels
216
01:13.23
7. Douglas Shamlin Jr.
692
02:11.52
8. COlDAiR
63
02:18.42
9. a979453451
184
02:34.02
10. XantheneL
45
02:36.29
Robots / programmatic solversinfo  
1.Charlie Li
61
00:00.253
2.4s4f400:00.464
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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2025-07-01 02:00:44

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