National Geographic Magnetic Marble Run 150-Piece Building Set for Kids | Magnetic Track, Trick Pieces, Marbles, Marble Maze, Engineering Toy, Creative Construction, STEM Project for Kids and Adults

A KICKSTARTER SUPERSTAR - This patented marble racetrack is the most backed Kickstarter magnetic super puzzle of all time! Each track and trick has its own unique properties—just move them around to adjust or add exciting new pathways!