The swirling Clementoni Action & Reaction circuits are now enriched with stunning effects for a sensational effect! You can 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 eddies with the spiral tracks! All circuits can also be customized with household objects, so children can let their imaginations run wild. The illustrated guide helps children create circuits of increasing difficulty, offering plenty of ideas to complete the tracks and introducing them to physics.