With plastic tiles: Skill Level.
Size 10.5 cm
How to play: remove the 16 pieces from the center core, and now try to put them all back on.
There are four different combinations to get all the pieces back on the ball
If you play with 2 Tetrix Balls, there are a total of 10 different combinations possible.
The 16 pieces can be placed inside the inner sphere, which can easily be opened for storage.