The GraviTrax Starter-Set XXL provides 242 pieces for constructing expansive marble runs. The interactive track system enables users to design custom race tracks while exploring principles of gravity, magnetism, and kinetics. Designed as a STEM toy for ages 8 and up, the GraviTrax line has sold over 15.5 million units globally and ranks as the top marble run system in the U.S. based on NPD Group data. All components integrate seamlessly with other GraviTrax sets for expanded building possibilities. The set suits both children and adults interested in hands-on construction and physics-based play.