Here, one starts with a number of odd shaped pieces with the objective of packing them back into a cube.
|  |  | Create a CubeIt's sort of like a Pandora's box, once they come out, it's almost impossible to get them back in. | 
|  |  | ImpuzzablesIf you really can't get enough of packing puzzles. Lakeside Games produced a series of these of varing colors and levels of difficulty. |