Ravensburger's interactive marble run system. With the GraviTrax marble run system, you can build your own marble run world by creatively using the laws of gravity. Use the various building elements to create an action-packed course and guide the marbles to the finish line using magnetism, kinetics, and gravity. With the GraviTrax marble run system, you can playfully discover gravity, and with various expansions, it can be extended for limitless building and playing fun! Add even more speed with the expansion sets. Transport your marbles back up! With this set, you take your marble run experience to a new level. Combine the lift and the additional building elements with your GraviTrax Starter-Set for even more action on the marble run. How many marbles can you transport back up with the lift? Includes: manual, 1 lift, 7 silver-coloured marbles, 1 transparent level, 8 large vertical pieces, 4 small vertical pieces, 1 long plastic track, 2 medium plastic tracks, 3 short plastic tracks. Only playable with the GraviTrax Starter-Set.