Kurodoko

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.

- For each number, count visible white cells (including itself) in straight lines up/down/left/right, stopped by black cells or grid edges; total must match the number.
- Numbered cells remain white (unshaded).
- All unshaded cells form a single polyomino (all whites should be connected orthogonally in a single group).
- Black cells cannot touch horizontally or vertically (diagonals allowed).

Left click on a cell to make it black. Right click to mark with dot. Click and drag to mark more than one cell.

Hide the rules

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5x5 Kurodoko | 7x7 Kurodoko | 10x10 Kurodoko | 15x15 Kurodoko | 20x20 Kurodoko

This Month
1.	PuzzleMaestro	00:09.37
2.	jaybrainer	00:11.36
3.	daanbe	00:12.37
4.	bugelover	00:14.35
5.	kennethaw88	00:17.47
6.	oversizedpixie	00:17.76
7.	firosibe	00:18.07
8.	haramey	00:18.17
9.	stevethesquid	00:18.51
10.	puzzlingpatzer	00:19.26
11.	Dorice	00:21.49
12.	Ailurus	00:26.36
13.	keehaag	00:29.65
14.	Suitjacket	00:29.70
15.	raelkid	00:30.17
16.	tuberculosis	00:36.39
17.	Jazzical Skunk	00:36.78
18.	TheBigMD	00:40.73
19.	RForce	00:41.90
20.	qobi	00:42.24

This Week
1.	PuzzleMaestro	00:09.37
2.	jaybrainer	00:11.36
3.	daanbe	00:12.37
4.	bugelover	00:14.35
5.	kennethaw88	00:17.47
6.	oversizedpixie	00:17.76
7.	firosibe	00:18.07
8.	haramey	00:18.17
9.	stevethesquid	00:18.51
10.	puzzlingpatzer	00:19.26
11.	Dorice	00:21.49
12.	Ailurus	00:26.36
13.	keehaag	00:29.65
14.	Suitjacket	00:29.70
15.	raelkid	00:30.17
16.	tuberculosis	00:36.39
17.	Jazzical Skunk	00:36.78
18.	TheBigMD	00:40.73
19.	RForce	00:41.90
20.	qobi	00:42.24

Today
1.	PuzzleMaestro	00:12.56
2.	stevethesquid	00:18.51
3.	Dorice	00:21.49
4.	raelkid	00:30.17
5.	tuberculosis	00:36.39
6.	qobi	00:42.24
7.	AGecko	00:55.83
8.	Fboogaard	01:50.06
9.	Trichinclay	01:57.52
10.	WilsonCWMui	02:53.15
11.	--- empty ---	--:--
12.	--- empty ---	--:--
13.	--- empty ---	--:--
14.	--- empty ---	--:--
15.	--- empty ---	--:--
16.	--- empty ---	--:--
17.	--- empty ---	--:--
18.	--- empty ---	--:--
19.	--- empty ---	--:--
20.	--- empty ---	--:--

MO3
1.	PuzzleMaestro	00:14.68
2.	daanbe	00:16.23
3.	jaybrainer	00:17.08
4.	haramey	00:18.45
5.	Vezzick	00:19.66
6.	Dorice	00:24.77
7.	oversizedpixie	00:26.18
8.	Indirar	00:27.27
9.	kennethaw88	00:30.20
10.	Aelenian	00:31.81

AO5
1.	PuzzleMaestro	00:13.96
2.	daanbe	00:16.93
3.	haramey	00:21.00
4.	Vezzick	00:21.48
5.	jaybrainer	00:22.29
6.	Aelenian	00:29.71
7.	Indirar	00:29.93
8.	Dorice	00:32.27
9.	oversizedpixie	00:35.31
10.	kennethaw88	00:37.44

AO12
1.	PuzzleMaestro	00:19.26
2.	daanbe	00:24.83
3.	jaybrainer	00:25.73
4.	Vezzick	00:29.06
5.	haramey	00:30.79
6.	Indirar	00:34.51
7.	Dorice	00:41.15
8.	Aelenian	00:41.42
9.	oversizedpixie	00:50.68
10.	stevethesquid	00:50.97

Robots / programmatic solvers		info
1.	--- empty ---	--:--
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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2025-10-10 20:13:43

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