Unleash your creativity with the Ravensburger GraviTrax Starter Set Marble Run. This STEM toy allows kids aged 8 and up to build interactive tracks, exploring gravity, magnetism, and kinetics. With 122 pieces included, children can design their own maze and track systems for endless fun. Compatible with all GraviTrax sets, this marble run system is perfect for expanding playtime. Recognized as the No.1 marble run system in the U.S., it makes an ideal gift for birthdays, holidays, and creative play.