With the GraviTrax Catapult you can flinge your marble and overcome some serious obstacles!Build new routes and create crazy trick shots, expand the marble run with new ideas, expansion sets to keep the ball rolling – compatible with all GraviTrax & GraviTrax PRO sets & accessories.Experiment with gravity to power your ball through twists, loops and turns in a race to the finish line – great building game for boys & girls.GraviTrax is made with premium quality materials adhering to the highest UK and EU standards and regulations.A GraviTrax Starter Set is required to use expansion packs & accessories. No batteries required. Other accessories sold separately. STEM and construction toys for kids age 8 years up. Great Christmas gifts and birthday presents for children.