Innovative gravitrax is a modular, electronic-free interactive track system where you can design and build your own race tracks and experiment with gravity, magnetism, and kinetics to propel your ball to the finish. Develops critical skills playing and building with gravitrax develops spatial reasoning and planning skills, and provides a great stealth learning experience for STEM. Send the marble in the reverse direction with the flip! As the marble rolls into the flip, it releases and transports up a level, slinging it in the opposite direction. This accessory also includes 6 additional tracks and must be combined with the gravitrax starter set. Gravitrax is a modular, electronic-free interactive track system where you can design and build your own marble runs. This STEM toy for boys and girls 8 and up, encourages experimenting with gravity, magnetism, and kinetics to propel your marble to the finish. Designed with open play in mind, the concept offers endless possibilities to design a different track every time you play. Expand your builds and add some action with a variety of expansion sets and Accessories. Whats in the box comes with 7 pieces, including 1 flip action tile, 1 long Track, 2 medium tracks, and 3 short tracks.