Source google image: http://4.bp.blogspot.com/-eWAlg6-J5os/UyHEV5C-AFI/AAAAAAAAClc/tttpqf8N5CY/s1600/Shikaku+Example.png
Shikaku puzzle
Source google image: http://4.bp.blogspot.com/-eWAlg6-J5os/UyHEV5C-AFI/AAAAAAAAClc/tttpqf8N5CY/s1600/Shikaku+Example.png