3D Memory Sequential Maze Ball: Our Maze ball is a new type of puzzle toy, inspire inspiration, relieve stress, bring you unlimited fun; Gravity maze can help children puzzle early education, but also can exercise your hand-eye coordination, patience, attention, spatial imagination and creative thinking skills Quality Material: The shell of our maze ball is made of transparent ABS, which is durable, and the internal track is made of soft plastic, so please be careful not to push too hard when rolling the small steel ball, so as not to get the small steel ball stuck in the track; With a size of 4in/ 10cm in diameter, the Maze ball is lightweight and easy to carry, so you can enjoy this brain teaser game anytime, anywhere Challenge Tips: The interesting brain games maze does not need to set, clean and install batteries, hold the maze ball in both hands to keep calm, give full play to your spatial imagination, observe the characteristics of each level, change the orientation of the ma...