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

This Month
1. Meerkat
210
00:07.10
2. gazil 00:10.88
3. Truth-or-Peace
130
00:10.91
4. missPear
90
00:12.73
5. Encyclopedia
85
00:13.92
6. Jbrunt
131
00:14.89
7. Dorice
261
00:16.14
8. qobi
234
00:18.59
9. Jack63kids
171
00:20.60
10. junesnow17 00:22.30
11. dingeldrum
41
00:22.50
12. AlistairMacAllister
67
00:23.63
13. Kutner17
151
00:24.22
14. Kukurbo
87
00:24.45
15. stevethesquid
74
00:24.97
16. Partimento
52
00:25.74
17. S Otenkiya
58
00:27.09
18. grimmgirlfandom
168
00:29.69
19. PawDub
49
00:31.06
20. AnonyMinor
72
00:31.23
This Week
1. dingeldrum
41
00:22.50
2. S Otenkiya
58
00:27.09
3. qobi
234
00:29.01
4. Efran
50
00:43.07
5. Hammernose
5
00:49.73
6. MishaVargas
1
00:52.86
7. windex42
34
00:53.79
8. rafrux
13
01:17.81
9. TrimTom2
11
02:15.40
10. Ariadna
32
03:24.69
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
15.--- empty -----:--
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
Today
1. S Otenkiya
58
00:27.09
2. qobi
234
00:32.87
3. Efran
50
00:43.07
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. numbrr
307
00:09.88
2. PuzzleMaestro
83
00:09.91
3. hhhhhh2
139
00:10.65
4. daanbe
220
00:10.90
5. Make
278
00:11.34
6. Oryn
166
00:11.93
7. jaybrainer
250
00:12.05
8. Puzzleist
115
00:13.05
9. qqwref
266
00:13.14
10. boru
123
00:13.35
AO5
1. PuzzleMaestro
83
00:10.08
2. numbrr
307
00:11.68
3. Make
278
00:11.87
4. Oryn
166
00:12.02
5. daanbe
220
00:12.36
6. hhhhhh2
139
00:12.68
7. jaybrainer
250
00:13.81
8. Puzzleist
115
00:14.19
9. Meerkat
210
00:14.58
10. haramey
235
00:15.06
AO12
1. PuzzleMaestro
83
00:12.45
2. daanbe
220
00:15.25
3. Make
278
00:15.29
4. jaybrainer
250
00:16.64
5. hkjsf
149
00:16.91
6. Oryn
166
00:16.97
7. numbrr
307
00:17.49
8. MoFan
119
00:17.56
9. Meerkat
210
00:17.84
10. hhhhhh2
139
00:18.37
Robots / programmatic solversinfo  
1.Paul Bismuth
1
00:01.055
2.Elizabeth Tang
1
03:04.647
3.QiRiver
1
27:53.962

* 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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2026-02-08 14:54:51

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