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. Truth-or-Peace
132
00:02.79
2. Hwellyn
75
00:03.41
3. Kukurbo
92
00:03.53
4. GoldChoco36
152
00:03.80
5. Jbrunt
138
00:04.49
6. Liliumauratum
18
00:04.77
7. missPear
90
00:04.80
8. Meerkat
211
00:05.40
8. RelaxedCockatoo
67
00:05.40
10. qobi
234
00:05.52
10. Erinires
30
00:05.52
12. mfcs3
42
00:05.73
13. Nieznany 00:06.12
14. Kukko
161
00:06.51
15. Cxxx006
29
00:06.97
16. KarasuKarasu 00:06.98
17. fishysua
154
00:07.12
18. cruadin
121
00:07.22
19. *** *****
146
00:07.37
20. limima
35
00:07.53
This Week
1. Truth-or-Peace
132
00:02.79
2. missPear
90
00:04.80
3. RelaxedCockatoo
67
00:05.40
4. Jbrunt
138
00:05.99
5. fishysua
154
00:07.12
6. qobi
234
00:08.09
7. xkbz0809
17
00:09.03
8. MishaVargas
1
00:09.08
9. Kiran 00:13.11
10. daspore 00:15.06
11. Ariadna
33
00:15.98
12. twinklingstar15
9
00:16.72
13. thelegendary08
28
00:19.28
14. kosiakesi 00:24.71
15. VinsanityJr
30
00:25.81
16. josh67
1
00:29.05
17. Admiral 00:33.62
18. xuan
22
00:34.62
19. Aloe
34
00:38.90
20. AtomicT
45
00:41.29
Today
1. qobi
234
00:16.97
2.--- empty -----:--
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. jaybrainer
253
00:02.32
2. hhhhhh2
140
00:02.93
3. numbrr
308
00:03.27
4. PuzzleMaestro
89
00:03.76
4. boru
123
00:03.76
6. hkjsf
152
00:03.79
7. daanbe
222
00:04.02
8. Meerkat
211
00:04.22
9. haramey
236
00:04.29
10. Arok
115
00:04.33
AO5
1. jaybrainer
253
00:02.93
2. hhhhhh2
140
00:03.56
3. PuzzleMaestro
89
00:03.76
4. numbrr
308
00:03.97
5. daanbe
222
00:03.99
6. boru
123
00:04.14
7. hkjsf
152
00:04.45
8. Make
278
00:04.46
9. Truth-or-Peace
132
00:04.62
10. Meerkat
211
00:04.78
AO12
1. jaybrainer
253
00:03.71
2. hhhhhh2
140
00:04.51
3. numbrr
308
00:04.66
4. PuzzleMaestro
89
00:05.12
5. Meerkat
211
00:05.36
5. daanbe
222
00:05.36
7. hkjsf
152
00:05.60
8. boru
123
00:05.71
9. Make
278
00:06.11
10. Ailurus
183
00:06.39
Robots / programmatic solversinfo  
1.Paul Bismuth
1
00:00.774
2.DayliteKaty00:10.556
3.Barth2400:12.837

* 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 04:03:30

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