Sky Runner is a free 3D platformer game playable in any browser. No download needed. Jump across wide floating neon platforms, follow the golden direction arrows, collect spinning gold coins, and reach the final platform. 5 lives, beginner-friendly physics, mobile joystick controls and desktop keyboard support. Orbital camera — rotate with middle mouse or touch. Built with Three.js WebGL. Works on Chrome, Firefox, Safari, Edge — iPhone, Android, PC, Mac.