The swirling Clementoni Action & Reaction circuits now feature stunning effects for a truly sensational experience! Use the transparent tracks and glow-in-the-dark balls to create amazing routes with fantastic special effects! Create exciting routes with the suspension bridge, double the circuits with branches, and race through spectacular swirls with the spiral tracks! All the circuits can also be customized with household objects, giving children free rein to their imaginations. The illustrated manual helps children create circuits of increasing difficulty, provides plenty of ideas to complete the tracks, and introduces them to physics.