Experience the power of gravity! GraviTrax is the all Construction toy STEM track system from Ravensburger! Use your imagination to build superb tracks and set the gravity spheres rolling! Raise your track to new heights! Press the lever as a marble enters the Lifter at the bottom to release the marble at the top. Combine the Lifter with your GraviTrax Starter-Set for an elevated experience! How many marbles can you raise to the top? This STEM system [Science, Technology, Engineering and Maths] is an ideal one to teach kids about gravity, magnetism, kinetic energy and fun. Hit a snag? Freestyle with your own track design or use the tasks and blueprints included to help you to get started in the world of GraviTrax! Are the gravity spheres stopping or flying off before reaching the end target? Time for some problem solving. Rebuild and try something different! The GraviTrax track system can be extended indefinitely with extra track packs and add-on’s – each sold separately. This set is s