Math Crowd Runner Educational Game Build

Build an engaging, browser-based 3D educational math runner game for kids and classrooms in a single standalone HTML file using Three.js via CDN. Players guide an expanding squad of colorful 3D runners along an obstacle track, running through mathematical gate portals (+, -, ×, ÷) to solve mental arithmetic challenges. Features responsive touch and mouse steering, dynamic crowd flocking physics, Web Audio API sound feedback, progress score tracking, and instant level restarts.