This is a challenging three-dimensional puzzle in which the player must maneuver a small ball along a numbered path and around challenging barriers inside a transparent sphere. There are 30 challenging obstacles to navigate, including dead-ends, at which the player must twist the sphere to realign the inside rails.Recommended for ages 8 - 13. Entertaining, education and great for fine motor skills and hand eye coordination. This one ins in very good pre-owed condition. Please see all photos and ask questions before bidding / buying. From a smoke free home. Thanks for looking.