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
107
00:12.75
2. NoahR
166
00:35.93
3. Andy100
77
00:38.48
4. CoBoMa 00:43.03
5. stevethesquid
37
00:51.95
6. brac37 01:08.98
7. WLF117171711 01:16.73
8. David Hwang
26
01:27.44
9. Solander 01:43.35
10. Michelins
19
04:02.50
11. Ermanr 04:24.55
12. Chl
13
05:17.56
13. Nic0rasu 13:00.81
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This Week
1. brac37 01:08.98
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Today
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MO3
1. bearn
107
00:14.68
2. mediteran13
54
00:16.12
3. Douglas Shamlin Jr.
383
00:18.60
4. sfumato
144
00:19.20
5. IHNN1
9
00:20.27
6. EinsteinsBarber
77
00:29.91
7.anonymous
44
00:31.54
8. numbrr
98
00:38.89
9. Fastfaxer
115
00:40.43
10. Ramasp
141
00:42.99
AO5
1. bearn
107
00:16.61
2. Douglas Shamlin Jr.
383
00:17.00
3. mediteran13
54
00:20.45
4. sfumato
144
00:21.11
5. IHNN1
9
00:24.92
6.anonymous
44
00:35.65
7. EinsteinsBarber
77
00:38.05
8. numbrr
98
00:38.89
9. Ramasp
141
00:42.99
10. Fastfaxer
115
00:45.94
AO12
1. bearn
107
00:18.95
2. Douglas Shamlin Jr.
383
00:27.91
3. sfumato
144
00:28.16
4. IHNN1
9
00:40.76
5.anonymous
44
00:42.55
6. Fastfaxer
115
00:54.06
7. EinsteinsBarber
77
00:58.10
8. arcer
84
01:03.31
9. numbrr
98
01:07.77
10. Andrej Senkic
36
01:11.00
Robots / programmatic solversinfo  
1.Charlie Li
60
00:00.473
2.nbjohnson00:00.639
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* 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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2022-05-26 01:43:59

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