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
90
02:34.40
2. Mia
92
04:17.22
3. SweatyBetty 04:32.35
4. chenh 04:43.42
5. Meerkat
211
04:53.58
6. 먼지
74
05:02.49
7. puzzlingpatzer
90
05:23.24
8. dreadsom
107
05:30.45
9. PeachClobbers
159
05:33.48
10. Cxxx006
29
05:38.21
11. ihaveit 05:52.70
12. kennethaw88
154
05:59.55
13. zanzibar528
45
06:09.77
14. takaz 06:14.99
15. ezyow
30
06:16.86
16. Kukko
164
06:47.99
17. GoldChoco36
152
06:52.35
18. Alachas
23
06:55.87
19. qobi
234
07:17.60
20. mm
78
07:22.36
This Week
1. Mia
92
04:54.98
2. SweatyBetty 05:11.03
3. puzzlingpatzer
90
05:23.24
4. dreadsom
107
05:30.45
5. zanzibar528
45
06:09.77
6. takaz 06:14.99
7. ezyow
30
06:16.86
8. chenh 06:20.53
9. ihaveit 06:56.69
10. mm
78
07:22.36
11. qobi
234
07:37.95
12. Tjips
79
07:40.90
13. BillysName 07:55.47
14. Indirica
76
08:31.88
15. Axin0627 09:03.36
16. SunshineDaisy 09:49.01
17. mattlancs
148
10:50.21
18. yosiaki
104
12:04.14
19. Partimento
55
12:49.38
20. Bhaskar 14:34.82
Today
1. SweatyBetty 05:11.03
2. mm
78
07:22.36
3. BillysName 07:55.47
4. takaz 08:07.85
5. Tjips
79
08:19.96
6. puzzlingpatzer
90
08:28.11
7. dreadsom
107
08:43.53
8. ChibiHoshi
19
17:38.91
9. yosiaki
104
21:26.87
10. qobi
234
21:06:09.05
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
15.--- empty -----:--
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
MO3
1. PuzzleMaestro
90
03:16.10
2. daanbe
223
03:30.24
3. Make
279
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. sealhy
188
05:18.59
9. Rhododendron
149
05:20.92
10. 먼지
74
05:22.40
AO5
1. daanbe
223
03:41.09
2. PuzzleMaestro
90
04:01.67
3. Make
279
04:29.17
4. 먼지
74
05:18.44
5. MS Paint
103
05:21.39
6. Meerkat
211
05:28.16
7. Mia
92
05:36.59
8. sealhy
188
05:37.05
9. Rhododendron
149
05:42.52
10. Indirica
76
05:48.54
AO12
1. daanbe
223
04:23.96
2. PuzzleMaestro
90
05:08.81
3. Make
279
05:09.81
4. Meerkat
211
05:57.62
5. MS Paint
103
06:01.56
6. 먼지
74
06:08.38
7. Rhododendron
149
06:26.98
8. sealhy
188
06:27.73
9. Indirica
76
06:46.43
10. keehaag
166
06:48.92
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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2026-03-11 19:46:41

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