Magical Mufti-functional Toy: Great for intelligence development, handsand eyes coordination and balance, spatial cognition, focus, observes ability and patiencetraining. Help to improve player's space imaginative ability, memory. Great Fun to Play Anywhere: 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. Safe to Use: This Labyrinth Brain Teaser Puzzles is made of ABS Non-Toxic plastic material, burr free, and the tiny steel ball is confined to the transparent protective cover, safe for children to play. Suitable for the Crowd: Suitable for 6+ kids, adults and the old aged. To increase the level of difficulty, the steel balls in the HARD and HIGHEST Difficulty level Maze are relatively small, choose the right maze you can work through or do not order if you're mind. For the Old Aged, you can choose the Red Color or Orange Color. Four Different Challenge Difficulty Levels to Choose From: The Red color for Easy level, the Orange color for Medium level, the Blue color for Hard level, and the Green color for Highest level. There are two kinds of Steel Balls inside the Maze, the Steel Ball inside the Red Maze (EASY LEVEL) and Orange Maze (MEDIUM LEVEL) are 4 mm in diameter, and 2 mm diameter inside the Blue Maze (HARD LEVEL) and Green Maze (HIGHEST LEVEL).