64-page book of step-by-step instructions for building 10 LEGO race cars and a custom track to race two cars at the same time. Includes all 124 bricks you need to build 10 different race cars, with variations in different colors and opportunity to mix-and-match pieces. Offers the unique combination of STEM learning and playful creativity in line with Klutz's bestselling LEGO Chain Reactions, LEGO Gadgets, and LEGO Gear Bots.