Shikaku

Shikaku (also known as Rectangles) is a logic puzzle with simple rules and challenging solutions.

The rules are simple. You have to divide the grid into rectangular and square pieces such that each piece contains exactly one number, and that number represents the area of the rectangle.

Click and drag to draw a rectangle. To remove lines use the right mouse button or hold the Ctrl or the Shift key.

Video Tutorial

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This Month
1.	Bluegill16384	00:52.73
2.	GeorgPfleger	00:54.52
3.	Flexo	00:58.45
4.	Goomy	01:02.78
5.	qobi	01:12.59
6.	Dorice	01:14.24
7.	zebramachine	01:23.07
8.	NOHJIWAN	01:28.78
9.	Sinner	01:29.91
10.	danpuzzler	01:41.75
11.	yosiaki	01:47.98
12.	Nienna	01:57.11
13.	Kutner17	02:01.77
14.	Suball	02:02.73
15.	olii#8008	02:03.06
16.	Easto	03:33.45
17.	klaii	04:06.10
18.	slowbutbad	04:43.04
19.	kornelbut	05:40.17
20.	Skemmer	09:22.56

This Week
1.	qobi	01:12.59
2.	GeorgPfleger	01:12.63
3.	zebramachine	01:23.07
4.	NOHJIWAN	01:28.78
5.	Kutner17	02:01.77
6.	Nienna	02:31.49
7.	yosiaki	03:06.21
8.	Skemmer	09:22.56
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Today
1.	GeorgPfleger	01:20.00
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MO3
1.	coolcoolguy65	00:27.60
2.	vowels	00:31.91
3.	bearn	00:35.40
4.	zahhydude1	00:35.59
5.	demian2	00:35.74
6.	numbrr	00:35.88
7.	ypw19	00:37.92
8.	JZE	00:38.08
9.	sfumato	00:42.83
10.	Icay	00:42.93

AO5
1.	coolcoolguy65	00:30.02
2.	vowels	00:31.91
3.	JZE	00:37.20
4.	demian2	00:37.73
5.	zahhydude1	00:37.79
6.	numbrr	00:38.80
7.	bearn	00:38.87
8.	Icay	00:43.17
9.	ypw19	00:43.46
10.	sfumato	00:46.40

AO12
1.	vowels	00:39.61
1.	coolcoolguy65	00:39.61
3.	zahhydude1	00:43.79
4.	JZE	00:44.03
5.	bearn	00:44.46
6.	numbrr	00:48.35
7.	Icay	00:49.29
8.	ypw19	00:52.89
9.	mtanzer	00:54.07
10.	qqwref	00:56.08

Robots / programmatic solvers		info
1.	tlstyer	00:00.007
2.	Charlie Li	00:00.222
3.	Paul Bismuth	00:04.179

* 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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2025-09-19 07:53:58

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