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
179
 00:26.67
2. ypw19
93
 00:40.51
3. dimitar243 00:41.84
4. NunSmacker 00:50.53
5. rosepetals
34
 00:51.07
6. krep12345 00:56.57
7. cyrex45
16
 00:57.32
8. daine
30
 00:59.86
9. 耒Donatien豕
6
 01:01.89
10. dbot
22
 01:02.41
11. Elliot20 01:05.70
12. geyik
218
 01:06.54
13. sheezus
22
 01:07.21
14. GraceL
37
 01:07.40
15. SniffTO 01:10.80
16. bantz
61
 01:16.40
17. GeorgPfleger
100
 01:16.69
18. mimer 01:17.47
19. Ak57wastoosmol 01:19.94
20. MuxxPedri 01:24.36
This Week
1. coolcoolguy65
179
 00:26.84
2. NunSmacker 00:50.53
3. rosepetals
34
 00:51.97
4. dimitar243 00:55.55
5. krep12345 00:56.57
6. cyrex45
16
 01:13.76
7. Nurr
22
 01:26.65
8. charwood 01:26.95
9. dirkdiggler 01:36.89
10. GeorgPfleger
100
 01:42.72
11. kazanok
13
 01:43.59
12. gethyped7 01:52.53
13. cansie 01:54.07
14. NihemT
31
 01:55.41
15. Panavia
30
 01:57.92
16. MrOof246
15
 02:05.60
17. wallickdeez
24
 02:14.15
18. NBGalli 02:17.86
19. llmt9
101
 02:20.68
20. Ryan P
12
 02:21.98
Today
1. coolcoolguy65
179
 01:07.50
2. cyrex45
16
 01:17.33
3. Panavia
30
 02:18.09
4. bella091
97
 02:59.82
5. lazysloth 03:17.71
6. coleslaw
25
 03:24.11
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. coolcoolguy65
179
 00:32.42
2. vowels
216
 00:41.60
3. bearn
206
 00:45.18
4. ypw19
93
 00:49.02
5. demian2
61
 00:55.33
6. zahhydude1
218
 00:55.76
7. numbrr
322
 00:56.76
8. rosepetals
34
 00:57.60
9. tanginess
48
 00:57.73
10. qqwref
266
 00:57.96
AO5
1. coolcoolguy65
179
 00:36.86
2. vowels
216
 00:44.38
3. ypw19
93
 00:51.43
4. bearn
206
 00:53.87
5. zahhydude1
218
 00:57.56
6. rosepetals
34
 00:59.61
7. tanginess
48
 01:00.67
8. keehaag
169
 01:00.96
9. qqwref
266
 01:01.66
10. JZE
88
 01:01.76
AO12
1. coolcoolguy65
179
 00:44.38
2. vowels
216
 00:51.97
3. ypw19
93
 00:55.60
4. bearn
206
 01:00.73
5. dbot
22
 01:09.80
6. zahhydude1
218
 01:10.35
7. qqwref
266
 01:11.21
8.anonymous
62
 01:12.93
9. JZE
88
 01:13.36
10. keehaag
169
 01:15.01
Robots / programmatic solversinfo  
1.dbut2
42
00:00.003
2.tlstyer
151
00:00.008
3.Charlie Li
61
00:00.224

* 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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