Kurodoko


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Kurodoko also known as Kuromasu is a logic puzzle with simple rules and challenging solutions.

The rules are simple.
Shade some cells black guided by number clues.

- Each number clue shows how many cells are "visible" from its place.
- "Visible" are all white cells up, down, left and right of the clue, terminated by a black cell or the grid edge. The cell with the number clue is also counted as visible.
- Other clue cells are considered transparent, so visibility continues through them.
- You can't shade clue cells black.
- All white cells must be connected orthogonally in a single group.
- Black cells can't touch orthogonally (diagonal touching is allowed).

Left click on a cell to make it black. Right click to mark with a dot. Click and drag to mark more than one cell.

Video Tutorial
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Kurodoko


5x5 Kurodoko | 7x7 Kurodoko | 10x10 Kurodoko | 15x15 Kurodoko | 20x20 Kurodoko

New Puzzle
This Month
1. numbrr
314
00:05.52
2. Oryn
173
00:07.73
3. Dorice
267
00:13.87
4. qobi
235
00:15.33
5. Debbie King
38
00:17.09
6. mbart
73
00:18.81
7. crema
266
00:19.72
8. splinkk
8
00:20.94
9. hq4hq
136
00:21.05
10. windex42
35
00:22.94
11. grimmgirlfandom
169
00:23.35
12. Partimento
58
00:25.30
13. wzh23
7
00:26.07
14. martosss
100
00:27.87
15. oversizedpixie
134
00:28.01
16. Vendetta907
94
00:29.83
17. kennethaw88
155
00:30.69
18. Solander
69
00:30.71
19. LesAM 00:31.56
20. bfakos
68
00:32.60
This Week
1. Debbie King
38
00:17.09
2. qobi
235
00:20.56
3. crema
266
00:21.93
4. grimmgirlfandom
169
00:23.35
5. mbart
73
00:23.68
6. wzh23
7
00:26.07
7. bfakos
68
00:32.60
8. Hammernose
5
00:46.60
9. StrikerMF4
4
00:48.24
10. tashhhh 00:56.84
11. whx
37
01:06.43
12. windex42
35
01:10.43
13. Fuksja Fuksjowa
43
01:17.08
14. Kiran 01:20.00
15. Tristan Neumann
50
01:29.44
16. JMS2026 04:31.62
17. NancyWoo
11
17:34.46
18. Nikopol
18
23:39.43
19.--- empty -----:--
20.--- empty -----:--
Today
1. qobi
235
00:24.27
2. tashhhh 00:56.84
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. PuzzleMaestro
92
00:08.67
2. numbrr
314
00:09.88
3. hhhhhh2
144
00:10.65
4. daanbe
231
00:10.90
5. Oryn
173
00:11.22
6. Make
279
00:11.34
7. Meerkat
212
00:11.56
8. jaybrainer
260
00:12.05
9. Puzzleist
115
00:13.05
10. qqwref
266
00:13.14
AO5
1. PuzzleMaestro
92
00:09.87
2. numbrr
314
00:11.68
3. Make
279
00:11.87
4. Oryn
173
00:12.02
5. daanbe
231
00:12.36
6. hhhhhh2
144
00:12.68
7. jaybrainer
260
00:13.81
8. Meerkat
212
00:14.05
9. Fastfaxer
131
00:14.16
10. Puzzleist
115
00:14.19
AO12
1. PuzzleMaestro
92
00:12.45
2. daanbe
231
00:15.25
3. Make
279
00:15.29
4. jaybrainer
260
00:16.64
5. hkjsf
158
00:16.91
6. Oryn
173
00:16.97
7. numbrr
314
00:17.49
8. MoFan
120
00:17.56
9. Meerkat
212
00:17.59
10. hhhhhh2
144
00:18.37
Robots / programmatic solversinfo  
1.Paul Bismuth
1
00:01.055
2.Elizabeth Tang
1
03:04.647
3.cheard
1
16:51.667

* 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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