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Ready to up your game by experiencing the true power of gravity? With 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. A Holiday Wish Guide™ Pick, The Rock Father™ and Ravensburger have teamed-up to showcase the GraviTrax System and give you a chance to win a GraviTrax Starter Set!