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. gazil 00:22.85
2. Meerkat
211
00:35.90
3. qobi
234
00:37.74
4. kennethaw88
154
00:39.29
5. Nieznany 00:43.57
6. Alachas
23
00:44.26
7. Fastfaxer
130
00:46.37
8. missPear
90
00:47.25
9. nerdvert
99
00:48.29
10. nosenugget
143
00:48.39
11. PArzi 00:52.93
12. Dorice
264
00:54.20
13. Lua
147
00:56.06
14. NormalSurface#7622
53
00:59.22
15. juhala 01:05.51
16. takaz 01:06.84
17. mattlancs
148
01:09.63
18. Wuni14 01:10.81
19. BeccaWorm
122
01:14.65
20. xilli 01:16.05
This Week
1. gazil 00:26.30
2. kennethaw88
154
00:40.95
3. missPear
90
00:47.25
4. Nieznany 00:51.99
5. PArzi 00:52.93
6. nerdvert
99
00:54.58
7. takaz 01:06.84
8. mattlancs
148
01:09.63
9. xilli 01:16.05
10. qobi
234
01:16.96
11. mbart
72
01:36.29
12. Wuni14 02:02.04
13. Hiro Lynx
42
02:39.12
14. Efran
50
02:56.54
15. MishaVargas
1
03:05.58
16. yvhkgys
34
04:02.24
17. Ariadna
34
04:02.81
18. JessicaLauren
14
05:55.94
19. yosiaki
104
06:17.60
20.--- empty -----:--
Today
1. gazil 00:30.18
2. Nieznany 01:03.65
3. nerdvert
99
01:04.29
4. qobi
234
01:16.96
5. MishaVargas
1
03:05.58
6. Efran
50
30:31.44
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
00:24.78
2. Fastfaxer
130
00:28.90
3. daanbe
223
00:29.27
4. numbrr
309
00:30.33
5. Make
279
00:32.40
6. Meerkat
211
00:37.39
7. kennethaw88
154
00:41.81
8. Truth-or-Peace
132
00:42.44
9. hkjsf
153
00:43.36
10. Oryn
169
00:43.66
AO5
1. PuzzleMaestro
90
00:25.67
2. daanbe
223
00:30.55
3. numbrr
309
00:31.29
4. Make
279
00:34.73
5. Fastfaxer
130
00:35.99
6. Meerkat
211
00:44.16
7. kennethaw88
154
00:46.00
8. qqwref
266
00:48.31
9. hkjsf
153
00:49.40
10. Ailurus
185
00:50.41
AO12
1. PuzzleMaestro
90
00:31.59
2. numbrr
309
00:35.75
3. daanbe
223
00:37.03
4. Make
279
00:45.20
5. Fastfaxer
130
00:50.57
6. Meerkat
211
00:55.16
7. qqwref
266
00:59.69
8. hkjsf
153
00:59.79
8. Rhododendron
149
00:59.79
10. kennethaw88
154
00:59.92
Robots / programmatic solversinfo  
1.Paul Bismuth
1
00:01.604
2.gazil900:53.440
3.qzdlogic03:26.545

* 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 18:50:10

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