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What is GraviTrax?\nWith the GraviTrax interactive track system, you can design and build your own marble runs and experiment with gravity, magnetism, and kinetics to propel your marble to the finish. With a variety of tiles, levels, tracks and elements, you can control the speed of the marble.\n\nThe open-play concept offers endless possibilities to design a different track every time you play. Add flair and speed to your tracks with expansion sets and action accessories. Experience the power of gravity with this epic marble run toy.\n\nGraviTrax - Products\nWith over 100 pieces and 18 different construction elements, the GraviTrax Starter Set offers everything you need to begin building your own action-packed marble run. Discover how the laws of physics affect the track your marble takes with curves, crosses, freefalls and even a cannon. Experiment using different heights and angles to control the speed of the marble.\n\nLooking to expand or extend your marble run? The Trax and Building Expansion Sets help you do just that. Combined, these expansion sets offer over 70 additional elements to add more levels to your track or to make your track longer to keep the marble rolling.