Hot Wheels Track Builder Unlimited Super-8 Kit delivers unlimited experimental building and rebuilding to pump up kids' imaginations to BUILD and BOOST! Kids can speed through the booster and count laps with three different configurations and parts for creating high banked turns for a gravity boost and a motorized booster for a big burst of speed! Build an oval speedway crazy curves or the super-8 layout with the battery powered booster and lots of straight track pieces of different sizes curves connectors and instructions to make it epic! The set connects to the Hot Wheels Race Portal (sold separately) It's easy to plug in the Hot Wheels Race Portal and download the free app for digital challenges tracking progress and games.