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. daanbe
222
01:44.29
2. Fastfaxer
130
01:47.71
3. Alachas
21
02:04.94
4. Annyamanee
82
02:18.21
5. Robert van den Broek
72
02:18.33
6. kennethaw88
154
02:28.20
7. Dorice
263
02:40.07
8. takaz 02:43.47
9. qobi
234
02:43.83
10. Savia
74
03:10.60
11. GoldChoco36
152
03:29.83
12. nerdvert
98
03:46.47
13. Liliumauratum
18
03:48.54
14. PlaidChocobo 03:59.77
15. mirovic 04:09.67
16. juhala 04:10.13
17. puzzlingpatzer
90
04:12.85
18. Eric Lin
53
04:17.48
19. Aelenian
128
04:24.07
20. xilli 04:31.13
This Week
1. Robert van den Broek
72
02:18.33
2. kennethaw88
154
02:28.28
3. qobi
234
03:11.48
4. GoldChoco36
152
03:29.83
5. Dorice
263
03:40.58
6. PlaidChocobo 03:59.77
7. puzzlingpatzer
90
04:12.85
8. nerdvert
98
04:14.20
9. Eric Lin
53
04:17.48
10. Aelenian
128
04:24.07
11. Kukurbo
92
04:56.89
12. AlexanderIII 04:59.37
13. mkmk
88
05:24.25
14. xilli 06:47.47
15. Ariadna
33
12:55.43
16. MishaVargas
1
19:05.50
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
Today
1. qobi
234
03:46.30
2. mkmk
88
07:34.30
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
89
01:14.11
2. daanbe
222
01:30.65
3. Make
278
01:55.81
4. numbrr
308
02:11.26
5. Oryn
168
02:24.23
6. kennethaw88
154
02:25.12
7. Fastfaxer
130
02:29.46
8. Rhododendron
149
02:30.80
9.anonymous
138
02:36.02
10. Ailurus
183
02:38.23
AO5
1. PuzzleMaestro
89
01:18.55
2. daanbe
222
01:39.69
3. Make
278
02:09.62
4. numbrr
308
02:28.34
5. Meerkat
211
02:44.09
6. Fastfaxer
130
02:44.85
7. Rhododendron
149
02:45.01
8. hkjsf
152
02:46.45
9. kennethaw88
154
02:47.03
10.anonymous
138
02:47.43
AO12
1. daanbe
222
01:47.02
2. PuzzleMaestro
89
01:48.80
3. Make
278
02:35.50
4.anonymous
138
02:58.57
5. Rhododendron
149
03:04.73
6. Robert van den Broek
72
03:04.88
7. numbrr
308
03:06.03
8. Meerkat
211
03:08.73
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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2026-03-01 03:55:10

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