Build spectacular marble runs with GraviTrax! Combine building blocks, platforms and rails to create your own routes and let your creativity run wild. With GraviTrax, the building possibilities are endless! Thanks to the different action blocks, your marbles will be able to be propelled at full speed, cross incredible obstacles, fall or even climb levels, and you will discover with them the laws of gravity! This Starter Set is ideal for discovering the GraviTrax universe or completing your collection, it can then be combined with all the products in the GraviTrax range.