The inner shell is made in a circular maze puzzle.
You have to have patience in order to get through this maze. This is a great brain teaser that will give you tons of fun. Twist the cube left, right, up, and down trying to get it fully closed and then take it back apart. Beat this maze and feel the success of winning!!
The parts of the puzzle are approximately 4" tall and 1 - 1 1/2" wide.