GraviTrax - Starter-Set XXLGraviTrax XXL Starter Set The GraviTrax XXL Starter Set is a comprehensive kit designed for advanced marble run builders who want to create expansive and intricate systems. With over 240 diverse pieces, it offers a wide range of building blocks including base plates, height tiles, tracks, and special action stones like the Magnetic Cannon, Hammer, and Loop. This set fosters exploration of gravity, magnetism, and kinetic energy, sharpening critical