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. toaster611
37
00:01.97
2. DrVince
48
00:02.78
3. 8bit
26
00:02.83
4. kushisthebush
3
00:03.04
5. Jaiven Eli
25
00:03.14
6. A2Ragnell
10
00:03.38
7. Eli Seeliger
9
00:03.44
8. Arjun25
19
00:03.60
9. xXEZXx 00:03.68
10. nabifan
69
00:03.79
11. Martin555
4
00:03.86
12. JaivenEli10
5
00:04.19
13. Carrick#5017
1
00:04.45
14. Sombro64 00:04.52
15. kyrawr8383
63
00:04.82
16. Dorice
148
00:05.40
17. joaoneto
1
00:05.45
18. HackMan
57
00:05.46
19. GenShin 00:05.57
20. hoganchan 00:05.66
This Week
1. toaster611
37
00:02.10
2. 8bit
26
00:02.83
3. Eli Seeliger
9
00:03.44
4. nabifan
69
00:03.79
5. Sombro64 00:04.52
6. A2Ragnell
10
00:04.77
7. HackMan
57
00:05.46
8. JaivenEli10
5
00:05.57
9. s56squared 00:05.87
10. qobi
142
00:07.13
11. MapWryte 00:07.35
12. kushisthebush
3
00:07.94
13. Carbon
25
00:08.05
14. medusaworm 00:09.01
15. concentration 00:09.89
16. kynkndjy 00:10.57
17. xilli 00:13.63
18. HarryNilsson 00:13.83
19. SELFan1 00:14.57
20. XFfrank
4
00:17.97
Today
1. nabifan
69
00:03.79
2. medusaworm 00:09.01
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MO3
1. Douglas Shamlin Jr.
432
00:01.68
2. sfumato
160
00:01.78
3. vowels
171
00:01.90
4. BingBongBob
76
00:02.00
5. bearn
127
00:02.03
6. nabifan
69
00:02.09
7. jai22933
16
00:02.24
8. IHNN1
11
00:02.28
9. mediteran13
54
00:02.46
10. jaybrainer
87
00:02.47
AO5
1. Douglas Shamlin Jr.
432
00:01.71
2. sfumato
160
00:01.89
3. vowels
171
00:01.96
4. nabifan
69
00:02.09
5. bearn
127
00:02.10
6. IHNN1
11
00:02.36
6. jai22933
16
00:02.36
8. BingBongBob
76
00:02.43
9. jaybrainer
87
00:02.44
10. mediteran13
54
00:02.50
AO12
1. Douglas Shamlin Jr.
432
00:01.87
2. vowels
171
00:02.15
3. sfumato
160
00:02.29
4. bearn
127
00:02.35
5. nabifan
69
00:02.45
6. BingBongBob
76
00:02.73
7. jaybrainer
87
00:02.88
8. jai22933
16
00:02.92
9. IHNN1
11
00:02.94
10. mediteran13
54
00:03.08
Robots / programmatic solversinfo  
1.nbjohnson00:00.407
2.Charlie Li
60
00:00.420
3.mediteran13
54
00:03.440

* 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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2022-12-01 19:00:21

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