Enter the GraviTrax Universe and unlock infinite marble run possibilities! The Marble Run GraviTrax Starter Set Bounce adds twists, turns and trick shots to every run with 2 action Element pieces. Create and experience marble run action like never with a unique interactive track-building system, and 101 track pieces!Build Beyond The Usual Challenge yourself, experiment and take the action further with action Elements. Use the Spiral Element to send your marbles round and round the bend, then bounce your way to the finish with 2-part Trampoline! Get inspired with the included track layout plans, or let your racing imagination go wild.The Marble Run GraviTrax Bounce Starter Set is compatible with all GraviTrax sets and accessories, so you can expand your marble run tracks, and explore the GraviTrax universe however you choose.Additional GraviTrax sets sold separately.