GraviTrax Expansion ScoopDetails: Keep your marble run excitement going with the Scoop. Triggered automatically when the marble rolls into it, the Scoop picks up the marble, swings like a trebuchet and propels the marble down the track of the next highest level. This accessory also includes 6 additional tracks and must be combined with the GraviTrax Starter Set . GraviTrax is a modular, electronic free interactive track system where you can design and build your own marble