Explore the innovative fusion of physical and digital realms in Mario Kart Live: Home Circuit through this 53-minute GDC talk. Delve into the tools, techniques, and challenges faced by Velan Studios in creating a mixed reality racing experience. Learn about the four-gate system, driving mechanics, camera calibration, and data streams from IMU samples and video. Discover the intricacies of banner detection, transition searches, pose estimation, and SLAM (Simultaneous Localization and Mapping) methodologies. Gain insights into trackspace user experience, gate progress tracking, and dynamic content rendering. Uncover the secrets behind seamlessly integrating physical play spaces with digital game elements to bring Mario Kart to life in players' homes.