Ravensburger GraviTrax The Game Impact Interactive Track System Solve new puzzles by building GraviTrax marble circuits, with elements and locations imposed by the challenge cards. 30 challenges to solve, 3 levels of difficulty. From 8 years old.
 
Can be expanded infinitely through extensions Creatively using the laws of gravity Use the various building elements Create an action-packed course Learn and use magnetism, kinetics and gravity.