With The Gravitrax Interactive Track System; You Can Design And Build Your Own Marble Runs And Experiment With Gravity; Magnetism; And Kinetics To Propel Your Marble To The Finish. With A Variety Of Tiles; Levels; Tracks And Elements; You Can Control The Speed Of The Marble. The Open-Play Concept Offers Endless Possibilities To Design A Different Track Every Time You Play. Add Flair And Speed To Your Tracks With Expansion Sets And Action Accessories. Experience The Power Of Gravity With This Epic Marble Run Toy.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.This Open-Ended; Screen-Free Stem Toy Makes The Perfect Activity For Boys And Girls Ages 8 And Up.