1) Mechanical puzzle
Found on
https://www.crosswordclues.com/clue/impossiball
The Impossiball is a rounded icosahedral puzzle similar to the Rubik`s Cube. It has a total of 20 movable pieces to rearrange, same as the Rubik`s Cube, but all of the Impossiball`s pieces are corners, like the Pocket Cube. == History == William O. Gustafson applied for a patent for the Impossiball design in 1981 and it was issued in 1984. Uwe ......
Found on
http://en.wikipedia.org/wiki/Impossiball
No exact match found.
