This 3D Maze Ball (hard level) is great fun to play anywhere, it’s about 10cm in diameter, easy to carry anywhere. Best desk toy for stimulating inspiration, relieve stress. Also good for parents-children games, party games killing time. This brain puzzles are interesting for people who love brain games, it's also a nice gift for your kids friends family colleague. Its great for intelligence development, hands & eyes coordination and balance, spatial cognition, focus, observes ability and patience training. Help to improve player's space imaginative ability, memory.