The Planet Cube is a 3D cube of 3,5 cm with 6 edge puzzle pieces. This cube is smaller than the original Happy Cube. Planet Cubes puzzle pieces can not be interconnected with the Happy Cube 5 edges puzzles of the oiginal 4 cm 3D cube. 

The Planet Cube is more difficult than Happy Cube for the human mind because it doesn’t resembles the human hand. A puzzle piece of a Happy Cube resembles the five fingers of the hand. Because of that the mind can easily reflect the image. Are you ready for this extraterrestrial challenge?