Gogogo 3D Intellectual Challenge Toy 100 Barriers Balance Maze Ball Puzzle Mini Size Combined counterweight, mental, logical thinking ability, hand dexterity game. Flip, twist, and spin the perplexus, attempting to move a ball along the numbered paths, while you work with and against the forces of gravity. Exercise practical ability, improve balance, enhance understanding of space. Size: diameter: approx. 12cm. Material: plastic.