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Four Colors for Two Different Difficulty Levels Hard Level - The blue maze ball, which has more More channels, narrow channels, and little steel ball to increase the level of difficulty.Medium Level - We reduced the difficulty of customs clearance, the passage is wider, and the steel balls are larger, so even younger children can easily pass the customs.Hardest Level- The green maze ball is the most difficulty.Easy Level - The red ball is more easy then others. The best office desk 3D maze puzzle toys for stimulating inspiration,relieve stress. Also good for parents-children games. More Detail Size：4*4inch Material: ABS Non-Toxic Material Great 3D Puzzle Game for Kids As the child grows up, stimulate the child's balance and coordination of both hands is very important, this 3d puzzle will make your child's thinking can be further improved. How to Play this 3D Maze Ball? The First: Starting from the beginning, run the mini ball.The Second: Use your head to get through the barriers.The T