GraviTrax is the interactive marble circuit designed by Ravensburger. With the GraviTrax track you can create a fantastic world of paths that follow the laws of gravity, all you need is the GraviTrax Starter-Set to start the adventure! You have more than 125 pieces at your disposal to create ever new paths. Roll multiple marbles at the same time to the finish line, using the principles of magnetism, kinetics and gravity. Fun is guaranteed!