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Science meets creativity with the GraviTrax Obstacle Course Set. This STEM toy encourages hands-on play where kids lead the way. With a variety of gravity-based elements, kids can create near limitless obstacle course marble run tracks. This set features all the components from the GraviTrax Starter Set, plus 5 additional expansions, including the Trampoline, Zipline, Transfer, Spiral and Bridges. Experiment and problem solve by utilizing different elements to send the marbles from start to finish. Once the basics have been mastered, simply add more marbles and elements to the designs to create more advanced tracks and endless possibilities.