Nurikabe

﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿
Translate this site.

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.

Video Tutorial
Hide the rules

Share

This Month
1. puzzleist
28
00:02.91
2. asdfhavcjklcjkl 00:03.46
3. Solander 00:04.36
4. jiduoer 00:04.91
5. bundtcake
11
00:04.93
6. Party14534
4
00:04.95
7. BobTheJedi
30
00:05.26
8. da32s1da
15
00:05.66
9. Jbrunt
79
00:05.83
10. medusaworm 00:06.64
11. Speedygoofers
3
00:07.34
12. Dorice
169
00:07.83
13. fishysua
96
00:09.51
14. bonk
64
00:09.82
15. Kenolo353
57
00:10.91
16. JameSummer 00:11.46
17. qobi
151
00:11.65
18. Mmemagique
4
00:11.72
19. BTW
2
00:15.59
20. Colpannik 00:20.57
This Week
1. puzzleist
28
00:02.91
2. Solander 00:05.15
3. Jbrunt
79
00:05.83
4. Speedygoofers
3
00:07.34
5. medusaworm 00:09.96
6. Kenolo353
57
00:10.91
7. Gage Williams
16
00:31.13
8. kc2dpt 00:36.26
9.--- empty -----:--
10.--- empty -----:--
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
15.--- empty -----:--
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
Today
1.--- empty -----:--
2.--- empty -----:--
3.--- empty -----:--
4.--- empty -----:--
5.--- empty -----:--
6.--- empty -----:--
7.--- empty -----:--
8.--- empty -----:--
9.--- empty -----:--
10.--- empty -----:--
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
15.--- empty -----:--
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
MO3
1. vowels
181
00:01.74
2. sfumato
161
00:01.76
2. Douglas Shamlin Jr.
457
00:01.76
4. nabifan
76
00:01.81
5. bearn
139
00:02.05
6. jai22933
21
00:02.17
7. mediteran13
54
00:02.23
8. IHNN1
11
00:02.32
9. jaybrainer
121
00:02.65
10. haramey
58
00:02.73
AO5
1. vowels
181
00:01.81
1. Douglas Shamlin Jr.
457
00:01.81
3. nabifan
76
00:01.85
4. sfumato
161
00:01.92
5. bearn
139
00:02.18
6. mediteran13
54
00:02.32
7. jai22933
21
00:02.35
8. IHNN1
11
00:02.44
9. jaybrainer
121
00:02.75
10. numbrr
152
00:02.76
AO12
1. vowels
181
00:02.13
2. sfumato
161
00:02.24
3. Douglas Shamlin Jr.
457
00:02.26
4. nabifan
76
00:02.29
5. jai22933
21
00:02.48
6. bearn
139
00:02.50
7. mediteran13
54
00:02.96
8. IHNN1
11
00:02.97
9. qqwref
230
00:03.36
10. toaster611
42
00:03.52
Robots / programmatic solversinfo
1.4s4f400:00.241
2.nbjohnson00:00.398
3.Charlie Li
60
00:00.417

* 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.
You need to be logged in to track your averages