- For children and adults from 8 years - Ravensburger's interactive bullet track system - With the gravitrax bullet track system you can build your own bullet -lane world by creative use of the laws of gravity use the various building elements to make a trail full of action and the bullets to the finish, Garnetism - with the Kineticism, with the Kineticism, with the Kineticism with the Kineticism, with the Kineticism, with the Kineticism, with the Kineticizem, s kinetiko, s kinetiko, s kinetiko, s kinetiko, s kinetiko, s kinetiko. System Bullet Track lahko igrivo odkrije gravitacijo in z različnimi razširitvami ga je mogoče povečati za brezmejno gradnjo in igranje užitka; Dodajte še večjo hitrost z razširitvenimi kompleti - združite toliko, kot želite -, ker so vsi kompleti gravitraksa združljivi med seboj