Create your own action-packed marble run tracks with this interactive GraviTrax Starter Set construction toy for kidsThe GraviTrax Starter Set includes height tiles, turns, tracks, and a magnetic cannon for endless building activities to do on your own or in a groupThis 122-piece STEM toy offers a screen-free activity that fosters problem solving, creativity and experimentation for kids ages 8 and upDesign, build and race the marbles using gravity, magnetism, and kinetics to propel them to the finishPut your skills to the test with instructions for 9 different track layouts and 24 fun challenges that encourage critical thinkingWith over 6 million sold worldwide, GraviTrax makes an awesome birthday present or holiday gift for budding engineers or kids who love to build