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.	coolcoolguy65	00:15.42
2.	tanginess	00:25.34
3.	Noridice	00:27.84
4.	venipede	00:32.18
5.	Jen Jay	00:35.50
6.	teacherW66	00:35.58
7.	DJdeMaster	00:35.83
8.	Oryn	00:37.85
9.	GeorgPfleger	00:37.86
10.	Dorice	00:42.25
11.	Lanmo	00:44.18
12.	Jazka	00:45.50
13.	danpuzzler	00:46.92
14.	trLBumm	00:58.25
15.	k03ih01	01:06.31
16.	Nagisae	01:06.63
17.	foggy11	01:12.79
18.	banach	01:14.40
19.	rob69	01:14.48
20.	wyq97	01:22.38

This Week
1.	coolcoolguy65	00:15.42
2.	Noridice	00:27.84
3.	Jen Jay	00:35.50
4.	teacherW66	00:40.38
5.	GeorgPfleger	00:43.66
6.	Dorice	00:43.90
7.	Lanmo	00:44.18
8.	Dchair	01:29.52
9.	saitama	01:34.35
10.	vesek	02:40.51
11.	12345678999	03:29.62
12.	rob69	10:06.28
13.	--- empty ---	--:--
14.	--- empty ---	--:--
15.	--- empty ---	--:--
16.	--- empty ---	--:--
17.	--- empty ---	--:--
18.	--- empty ---	--:--
19.	--- empty ---	--:--
20.	--- empty ---	--:--

Today
1.	coolcoolguy65	00:15.42
2.	teacherW66	00:40.38
3.	GeorgPfleger	00:45.32
4.	12345678999	03:29.62
5.	--- empty ---	--:--
6.	--- empty ---	--:--
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.	zahhydude1	00:17.66
2.	vowels	00:17.91
3.	demian2	00:19.43
4.	coolcoolguy65	00:19.84
5.	bearn	00:20.58
6.	JZE	00:21.12
7.	Luke Pickett	00:22.75
8.	numbrr	00:24.41
9.	ypw19	00:25.10
10.	Icay	00:25.90

AO5
1.	vowels	00:18.50
2.	zahhydude1	00:19.23
3.	demian2	00:21.11
4.	coolcoolguy65	00:21.75
5.	JZE	00:21.89
6.	bearn	00:22.87
7.	Luke Pickett	00:24.18
8.	ypw19	00:24.52
9.	numbrr	00:25.40
10.	qqwref	00:26.32

AO12
1.	vowels	00:22.07
2.	zahhydude1	00:24.21
3.	coolcoolguy65	00:25.09
4.	bearn	00:26.73
5.	numbrr	00:29.02
6.	ypw19	00:29.47
7.	JZE	00:29.51
8.	Luke Pickett	00:30.90
9.	Icay	00:31.14
10.	qqwref	00:32.21

Robots / programmatic solvers		info
1.	tlstyer	00:00.007
2.	Charlie Li	00:00.213
3.	Paul Bismuth	00:03.112

* 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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2025-12-12 21:29:12

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