The Action Set Twist includes everything needed to build custom tracks full of ball action. Endless fun thanks to limitless possibilities. With the GraviTrax Action Set Twist, varied and unique tracks can be created. The included action elements provide endless building enjoyment: The spiral allows balls to overcome height differences at high speed, can be assembled to different heights, and perfectly adapts to any track. The trampoline adds new momentum 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 can create not just simple marble runs, but unique marble run worlds. By freely designing the marble runs and exploring the rolling behavior of the balls, understanding of science is sharpened, and gravity is experienced up close. The GraviTrax universe includes three exciting lines - Core, Pro, and Power. All GraviTrax lines and products can be freely combined. With countless expansions using classic building elements or stones that enable special action and tricks, the GraviTrax universe can be infinitely expanded. This allows everyone to tinker, experiment, and build beyond their limits.