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
211
01:48.12
2. Alachas
23
02:04.58
3. cal
74
02:06.47
4. takaz 02:06.91
5. Annyamanee
82
02:10.66
6. Robert van den Broek
73
02:18.33
7. kennethaw88
154
02:28.28
8. qobi
234
02:36.22
9. Dorice
264
02:40.07
10. missPear
90
02:50.92
11. sutchinger
87
03:00.31
12. Indirica
76
03:01.13
13. Savia
75
03:10.60
14. PlaidChocobo 03:26.97
15. GoldChoco36
152
03:29.83
16. nerdvert
99
04:02.55
17. mirovic 04:09.67
18. juhala 04:10.13
19. puzzlingpatzer
90
04:12.85
20. Eric Lin
53
04:17.48
This Week
1. Meerkat
211
01:48.12
2. Alachas
23
02:04.58
3. takaz 02:06.91
4. Annyamanee
82
02:10.66
5. qobi
234
02:36.22
6. missPear
90
02:50.92
7. cal
74
02:59.60
8. Indirica
76
03:01.13
9. PlaidChocobo 03:26.97
10. xilli 04:35.80
11. yosiaki
104
05:10.06
12. mkmk
88
05:13.91
13. cyrus#9023
18
05:37.85
14. AlexanderIII 05:49.59
15. Wuni14 06:18.55
16. drcook
5
06:49.14
17. Partimento
55
07:00.61
18. JessicaLauren
14
08:40.94
19. Glen Waldron
9
09:21.05
20. bfakos
67
10:47.79
Today
1. qobi
234
05:42.91
2. mkmk
88
05:57.76
3. JessicaLauren
14
08:40.94
4. Partimento
55
11:59.19
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
90
01:14.11
2. daanbe
223
01:30.65
3. Make
279
01:55.81
4. numbrr
309
02:11.26
5. Meerkat
211
02:17.46
6. Annyamanee
82
02:23.83
7. Oryn
169
02:24.23
8. kennethaw88
154
02:25.12
9. Fastfaxer
130
02:29.46
10. Rhododendron
149
02:30.80
AO5
1. PuzzleMaestro
90
01:18.55
2. daanbe
223
01:39.69
3. Make
279
02:09.62
4. Meerkat
211
02:16.31
5. numbrr
309
02:28.34
6. Annyamanee
82
02:34.84
7. Fastfaxer
130
02:44.85
8. Rhododendron
149
02:45.01
9. hkjsf
153
02:46.45
10. kennethaw88
154
02:47.03
AO12
1. daanbe
223
01:47.02
2. PuzzleMaestro
90
01:48.80
3. Make
279
02:35.50
4. Meerkat
211
02:57.52
5.anonymous
138
02:58.57
6. Rhododendron
149
03:04.73
7. Robert van den Broek
73
03:04.88
8. numbrr
309
03:06.03
9. qqwref
266
03:13.39
10. Fastfaxer
130
03:16.86
Robots / programmatic solversinfo  
1.Paul Bismuth
1
00:03.158
2.--- empty -----:--
3.--- empty -----:--

* 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 19:19:58

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