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. PuzzleMaestro
89
02:34.40
2. Mia
92
04:17.22
3. SweatyBetty 04:32.35
4. chenh 04:43.42
5. kennethaw88
154
04:44.98
6. Meerkat
211
04:53.58
7. 먼지
72
05:02.49
8. zeroz
1
05:21.68
9. PeachClobbers
159
05:33.48
10. Cxxx006
29
05:38.21
11. weiwei520 05:43.18
12. ihaveit 05:52.70
13. Indirica
76
06:08.88
14. dreadsom
107
06:12.48
15. ezyow
30
06:20.11
16. Kukko
161
06:47.99
17. Aelenian
128
06:53.22
18. Alachas
21
06:55.87
19. takaz 06:55.99
20. puzzlingpatzer
90
06:57.81
This Week
1. chenh 04:43.42
2. Meerkat
211
04:53.58
3. ihaveit 05:52.70
4. kennethaw88
154
06:03.14
5. dreadsom
107
06:12.48
6. SweatyBetty 06:15.18
7. puzzlingpatzer
90
06:57.81
8. ezyow
30
07:50.46
9. Dorice
263
08:12.02
10. GoldChoco36
152
08:19.30
11. Victorious1
198
08:21.68
12. Wuni14 10:02.91
13. Axin0627 10:33.49
14. Partimento
54
11:05.59
15. Tjips
73
11:45.63
16. Bhaskar 12:55.49
17. qobi
234
13:14.81
18. bfakos
67
14:30.88
19. mm
78
16:13.67
20. Brigitte Bardot
15
19:01.80
Today
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MO3
1. PuzzleMaestro
89
03:16.10
2. daanbe
222
03:30.24
3. Make
278
04:16.76
4. liyan
162
04:41.67
5. MS Paint
103
04:55.28
6. Meerkat
211
05:07.02
7. Mia
92
05:10.25
8. Rhododendron
149
05:20.92
9. 먼지
72
05:22.40
10. Indirica
76
05:27.68
AO5
1. daanbe
222
03:41.09
2. PuzzleMaestro
89
04:01.67
3. Make
278
04:29.17
4. MS Paint
103
05:21.39
5. 먼지
72
05:24.64
6. Meerkat
211
05:28.16
7. Mia
92
05:36.59
8. Rhododendron
149
05:42.52
9. Indirica
76
05:48.54
10. xzaxzaazx
106
06:04.78
AO12
1. daanbe
222
04:23.96
2. PuzzleMaestro
89
05:08.81
3. Make
278
05:09.81
4. Meerkat
211
05:57.62
5. MS Paint
103
06:01.56
6. 먼지
72
06:08.38
7. Rhododendron
149
06:26.98
8. Indirica
76
06:46.43
9. keehaag
166
06:48.92
10. sealhy
188
06:52.11
Robots / programmatic solversinfo  
1.Paul Bismuth
1
00:05.669
2.xiaruizebot00:18.220
3.Linomenium11:05:14.982

* 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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2026-03-01 05:15:55

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