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.

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

This Month
1.	PuzzleMaestro	01:37.46
2.	daanbe	02:58.40
3.	haramey	04:47.85
4.	Dorice	05:40.05
5.	Indirar	06:20.32
6.	keehaag	06:39.95
7.	puzzlingpatzer	07:37.04
8.	kennethaw88	09:01.69
9.	stevethesquid	09:32.28
10.	qobi	10:58.45
11.	Gerben Wierda	12:12.62
12.	bugelover	16:18.33
13.	Jennalynn Morton	2:07:32.17
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This Week
1.	PuzzleMaestro	01:37.46
2.	daanbe	02:58.40
3.	haramey	04:47.85
4.	Dorice	05:40.05
5.	Indirar	06:20.32
6.	keehaag	06:39.95
7.	puzzlingpatzer	07:37.04
8.	kennethaw88	09:01.69
9.	stevethesquid	09:32.28
10.	qobi	10:58.45
11.	Gerben Wierda	12:12.62
12.	bugelover	16:18.33
13.	Jennalynn Morton	2:07:32.17
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Today
1.	PuzzleMaestro	01:37.46
2.	haramey	04:47.85
3.	Dorice	05:40.05
4.	kennethaw88	09:01.69
5.	stevethesquid	09:32.28
6.	qobi	15:16:00.72
7.	--- empty ---	--:--
8.	--- empty ---	--:--
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MO3
1.	PuzzleMaestro	02:18.16
2.	daanbe	04:51.87
3.	Indirar	04:57.26
4.	jaybrainer	05:20.95
5.	Dorice	07:21.09
6.	Amber Paige	08:05.93
7.	haramey	08:54.62
8.	puzzlingpatzer	09:51.14
9.	keehaag	10:29.25
10.	Ailurus	11:29.51

AO5
1.	PuzzleMaestro	02:18.91
2.	Indirar	05:37.64
3.	daanbe	06:44.85
4.	Dorice	07:21.09
5.	Amber Paige	09:13.01
6.	puzzlingpatzer	11:06.10
7.	kennethaw88	11:40.45
8.	--- empty ---	--:--
9.	--- empty ---	--:--
10.	--- empty ---	--:--

AO12
1.	PuzzleMaestro	02:40.70
2.	Indirar	06:13.08
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Robots / programmatic solvers		info
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* 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 20:16:09

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