With the electronic GraviTrax Power Element Lever, balls can be repeatedly lifted to higher levels of the GraviTrax marble run one after the other. Gain height back again and again without manual intervention. The GraviTrax Power Element Lever lifts balls up to 4 height stones and automatically returns to its starting position after each ball. This allows the player to transport multiple balls to higher track levels in a single run. When combined with any starter set, the flow of the balls can be more precisely controlled, and the runtime of the track can be extended by repeatedly achieving height. GraviTrax offers endless building fun. By freely designing the marble runs and exploring the rolling and flying behavior of the balls, an understanding of science is sharpened, and gravity is made tangible. The STEM symbol on products indicates a category of games that makes science enjoyable. STEM (Science, Technology, Engineering, Mathematics) corresponds to the German MINT (Mathematics, Computer Science, Natural Sciences, Technology).