The interactive ball track system from Ravensburger. Create even more different ball tracks! With this set, you can expand your ball track from the Starter Set even further. Simply combine the additional floor plates and other building elements and see how complex your ball track can be! How many detours will your ball take to reach the finish line? With numerous expansion sets like this Building Set, free-building and constructing the interactive GraviTrax ball track system becomes even more interesting and exciting every time! More possibilities - more fun! Learn more at www.gravitrax.com