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.	keehaag	00:03.38
2.	hayei	00:03.39
3.	Green.wolf._	00:03.46
4.	vilodi	00:03.48
5.	kinbo71	00:03.68
6.	kroller	00:03.75
7.	Flexo	00:04.13
8.	Emberana	00:04.19
9.	trLBumm	00:04.30
10.	IAmLoup	00:04.41
11.	thall	00:04.60
12.	pato3042	00:04.83
13.	AlistairMacAllister	00:04.85
14.	Emzed	00:04.95
15.	toryx68	00:04.98
16.	GeorgPfleger	00:05.02
17.	dynesonne	00:05.27
18.	rob69	00:05.30
19.	Dorice	00:05.34
20.	empanadaslokas	00:05.37

This Week
1.	Green.wolf._	00:03.61
2.	trLBumm	00:04.30
3.	Dorice	00:05.34
4.	cheesekurtz	00:05.42
5.	dsab87	00:05.75
6.	imjoevegas	00:06.68
7.	toryx68	00:07.29
8.	HackMan	00:07.32
9.	venipede	00:07.37
10.	Rudrashembekar	00:09.23
11.	Jake Chaz	00:09.37
12.	998244353	00:09.45
13.	Flyingkitty789	00:10.91
14.	defcon673	00:11.05
15.	Savia	00:11.45
16.	battlecruiser12	00:13.81
17.	Maelwys	00:14.14
18.	CLAVDIVS	00:15.40
19.	aardappel	00:16.50
20.	WYJ	00:31.35

Today
1.	998244353	00:09.45
2.	battlecruiser12	00:13.81
3.	--- empty ---	--:--
4.	--- empty ---	--:--
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	00:01.45
2.	vowels	00:01.80
3.	CYrZx123	00:01.95
4.	nabi	00:02.07
5.	demian2	00:02.29
5.	BingBongBob	00:02.29
7.	jaybrainer	00:02.54
8.	numbrr	00:02.72
9.	anonymous	00:02.73
10.	JZE	00:02.79

AO5
1.	zahhydude1	00:01.56
2.	vowels	00:01.94
3.	CYrZx123	00:02.05
4.	nabi	00:02.21
5.	BingBongBob	00:02.40
6.	demian2	00:02.44
7.	numbrr	00:02.83
8.	jaybrainer	00:02.88
9.	anonymous	00:02.89
10.	JZE	00:03.01

AO12
1.	zahhydude1	00:01.74
2.	vowels	00:02.02
3.	CYrZx123	00:02.35
4.	nabi	00:02.41
5.	demian2	00:02.86
6.	BingBongBob	00:02.88
7.	anonymous	00:02.94
8.	jaybrainer	00:03.00
9.	numbrr	00:03.22
10.	Vicell	00:03.30

Robots / programmatic solvers		info
1.	tlstyer	00:00.006
2.	Charlie Li	00:00.211
3.	Paul Bismuth	00:01.045

* 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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2026-01-26 05:01:40

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