With the GraviTrax Action-Set Twist, varied and individual tracks can be created. The included Action-Elements allow endless building fun: The Spiral lets balls overcome height differences at rapid speed, can be assembled individually in its height and fits perfectly to any track. The Trampoline brings new drive and energy: it's a game with gravity! How high and far can the balls jump? GraviTrax is a flexibly expandable, interactive marble run system for children aged 8 and up: With GraviTrax, children, teenagers and adults don't just build simple marble tracks. They create unique marble track worlds. By freely designing the marble tracks and exploring the rolling behavior of the marbles, the understanding of science is sharpened and gravity can be experienced first-hand. The GraviTrax universe includes three exciting lines - CORE, PRO and POWER. All GraviTrax lines and products can be freely combined with each other. Countless Extensions with classic building elements or stones that allow special action and tricks, the GraviTrax universe can be infinitely expanded. So everyone can tinker, try out and build beyond themselves individell.