Shikaku


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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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Shikaku


5x5 Shikaku | 7x7 Shikaku | 10x10 Shikaku | 15x15 Shikaku | 20x20 Shikaku | 25x25 Shikaku

New Puzzle
This Month
1. coolcoolguy65
176
 00:26.34
2. rudi12 00:42.51
3. rosepetals
23
 00:49.52
4. Yuyinraoliang_1
18
 00:49.63
5. dimitar243 00:50.32
6. NunSmacker 00:51.75
7. 50R3N6
17
 00:51.86
8. daine
27
 00:52.38
9. elinor0406 00:58.27
10. Hjaka14
27
 01:02.72
11. gotFunk 01:06.48
12. 耒Donatien豕
6
 01:06.83
13. konna12 01:08.17
14. oxymiku 01:09.99
15. miggy
166
 01:11.55
16. GraceL
24
 01:11.71
17. bunionbobo
12
 01:11.79
18. Oneirodynia 01:12.80
19. obwoks
77
 01:13.42
20. 구연모
15
 01:14.01
This Week
1. coolcoolguy65
176
 00:32.36
2. Yuyinraoliang_1
18
 00:49.63
3. NunSmacker 00:51.75
4. rosepetals
23
 00:54.90
5. 耒Donatien豕
6
 01:06.83
6. konna12 01:08.17
7. GraceL
24
 01:11.71
8. hiiamweird
6
 01:15.73
9. cyrex45
9
 01:18.88
10. sirjohnsen
24
 01:29.21
11. Elliot20 01:30.82
12. llmt9
99
 01:33.22
13. SniffTO 01:33.45
14. GeorgPfleger
99
 01:33.57
15. infamousmauve 01:33.72
16. cansie 01:36.05
17. nitro1310 01:37.01
18. CRN
39
 01:57.07
19. Panavia
11
 02:23.72
20. NihemT
23
 02:24.05
Today
1. rosepetals
23
 01:04.14
2. 耒Donatien豕
6
 01:26.16
3. Elliot20 01:30.82
4. infamousmauve 01:33.72
5. GeorgPfleger
99
 01:35.52
6. NihemT
23
 02:24.05
7. PawDub
53
 03:45.94
8. xiang10231
1
 03:46.17
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. coolcoolguy65
176
 00:32.42
2. vowels
216
 00:41.60
3. bearn
206
 00:45.18
4. demian2
61
 00:55.33
5. zahhydude1
216
 00:55.76
6. numbrr
321
 00:56.76
7. tanginess
46
 00:57.73
8. qqwref
266
 00:57.96
9. JZE
88
 00:58.13
10. DukeAmsterdam
78
 00:59.11
AO5
1. coolcoolguy65
176
 00:36.86
2. vowels
216
 00:44.38
3. bearn
206
 00:53.87
4. zahhydude1
216
 00:57.56
5. tanginess
46
 01:00.67
6. keehaag
169
 01:00.96
7. qqwref
266
 01:01.66
8. JZE
88
 01:01.76
9.anonymous
62
 01:02.17
10. hoodxxc
239
 01:03.89
AO12
1. coolcoolguy65
176
 00:44.38
2. vowels
216
 00:51.97
3. bearn
206
 01:00.73
4. zahhydude1
216
 01:10.35
5. qqwref
266
 01:11.21
6.anonymous
62
 01:12.93
7. JZE
88
 01:13.36
8. keehaag
169
 01:15.01
9. DukeAmsterdam
78
 01:15.45
10. mp3some
113
 01:16.44
Robots / programmatic solversinfo  
1.tlstyer
151
00:00.008
2.Charlie Li
61
00:00.224
3.Paul Bismuth
1
00:07.037

* 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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