With GraviTrax you can explore gravity without ever getting bored, because the additional pieces allow you to expand your path to infinity. With the Tiptube first collect your marbles and then release them all together on the track. Use the Tiptube together with the GraviTrax Starter-Set to make your track even more beautiful. How long will you be able to stop your marbles on the track with the Tiptube? To be used only in conjunction with Gravitrax Starter Set.