Take marble run construction to a new level with the Ravensburger GraviTrax Action SetEnergy set! Explore the unique interactive ball track system of GraviTrax with 157 pieces, including 3 kinetic elements to add multi-level action and colourful light effects to your tracks!GraviTrax Energy combines the construction possibilities of the Core series with Power range effects, so you can create unique marble runs. Take marble action to new heights with the Vertical Cannon element, or use the Light element to add style to your creations. Challenge your track-building skills with curves, transparent levels and more!The GraviTrax system is endlessly expandable. Combine your set with additional Core or Pro sets for even more possibilities. Get inspired by the construction guide, or design your own custom tracks for limitless building creativity and STEM learning fun.