CapyDash: Biome Sprint is a 3D endless runner browser game built with Three.js and GSAP, where you control an animated capybara sprinting across 800 meters through three visually distinct biomes — lush Countryside, neon-lit CapyCity, and the cosmic void of Space. Race across three lanes, dodge concrete barriers and rocks, and collect coins, fruits, and power-ups to boost your score. Grab a watermelon or magnet to trigger speed boosts and auto-collect nearby coins. Chain pickups quickly to build a combo multiplier, pull off near-misses for bonus coins, and hit speed milestones for extra rewards. Each biome transition is marked by an immersive warp tunnel with custom GLSL shaders that blend sky colors and animate a scrolling grid portal. Lighting, fog, and the PBR environment map all transition smoothly as you cross into each new world. Before the race, customize your capybara with one of six hats — top hat, wizard hat, pirate cap, and more. The game features dynamic camera FOV that widens at high speed, camera shake on impact, speed-lines, a star field in space, particle bursts on coin collection, and full post-processing effects. Controls are keyboard and touch-friendly. A local leaderboard tracks your five best race times across sessions.