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.	ypw19	00:25.07
2.	Sloiw	00:54.79
3.	GeorgPfleger	01:00.24
4.	nysnuib	01:01.67
5.	zebramachine	01:09.37
6.	Dorice	01:17.61
7.	doodlepoodle100	01:17.90
8.	OrxhidCrimes	01:18.42
9.	May John	01:25.45
10.	Educated-cat	01:34.00
11.	teacherW66	01:35.00
12.	aeunchae	01:41.41
13.	chmurka	01:52.17
14.	Skutti	01:55.99
15.	MarkSnail	02:11.23
16.	NOHJIWAN	02:14.39
17.	Nienna	02:18.76
18.	Dchair	02:27.76
19.	wellwhynot	02:31.92
20.	naupactes	03:03.79

This Week
1.	ypw19	00:25.07
2.	GeorgPfleger	01:15.96
3.	MarkSnail	02:11.23
4.	Dchair	02:27.76
5.	naupactes	03:03.79
6.	chjthy	03:03.83
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Today
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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	00:35.90
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.	TheUgly	00:43.38
10.	ypw19	00:43.46

AO12
1.	coolcoolguy65	00:37.11
2.	vowels	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.	TheUgly	00:56.03

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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2025-11-07 02:02:10

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