Magic multi-functional toy: The 3D gravity puzzle is great for intelligence development, hand-eye coordination and balance, spatial cognition, focus, observation skills and patience training. Help improve the player's imagination, memory. Great fun to play anywhere: About 10cm in diameter, easy to carry anywhere. Best desk toy to stimulate inspiration, relieve stress. Also good for parent-child games, party games, kill time.. These brain puzzles are interesting for people who love brain games, it is also a nice gift for your children's friends, family colleagues. Safe to use: These maze brain teaser maze puzzles are made of non-toxic ABS plastic material, burr-free, and the small steel ball is confined to the transparent cover, safe 3D maze puzzle toys for kids to play. This classic puzzle game will never go out of style. Suitable for the audience: Suitable for children, adults and the elderly. To increase the difficulty, note that the channels and the small steel ball in the highest difficulty maze ball are narrow and small. For the older and small children, you can choose the red color or orange color, more easy to play 3D maze ball.