Take a spin on the "GraviTrax PRO: Carousel" and set your marble run on a whole new course of fascinating fun! Are you up for a marble run challenge? Then add the "GraviTrax PRO: Carousel" to your track and let your marbles go for a spin! Two levels each offer three entrances and exits. Pre-load the Carousel or load via incoming marbles. The next marble rotates the parked marble and sends it down the track. How many times can you give your marbles a ride on the Carousel? How does momentum change the dynamics? Explore the endless possibilities and experience the power of gravity and educational fun today! What makes a great toy? GraviTrax checks all the boxes! It's a creative, modular, expandable track system that challenges children to use their imagination to design and build their own marble runs! GraviTrax construction sets use STEM-friendly concepts while building critical thinking and problem-solving skills. Completely open-ended, every GraviTrax set has a boredom-busting variety of play options for hours of fascinating fun. Once the basics are mastered, simply add expansion sets and accessories to propel those metal marbles around the tricked-out track of your dreams! Comes complete with instructions and 1 Carousel (4-tiles high; easily assembled). Lasting durability for girls and boys ages 8 and up, it's the learning toy children (and savvy adults) return to over and over again.