Rollercaster

Rollercaster turns a plain-words description of a roller coaster into a 3D ride you can take from the front seat, free in your browser. It needs JavaScript and WebGL, so turn JavaScript on to play.

Type something like “a wooden coaster through an autumn forest with a big first drop” or “a shark-themed inverted coaster with two loops over the ocean”. An AI model (Gemma 4 on Cloudflare Workers AI) drafts a track program, a physics engine builds it into a closed circuit and test-rides it for g-forces, stalls and collisions, a repair step fixes what it can, and the best ride wins.

Ride types include steel, wooden, hybrid, inverted, flying, wing, wild mouse, bobsled, log flume, mine train, steam train and kiddie coasters, with loops, corkscrews, zero-g rolls, cobra rolls, helices and airtime hills. Pick a biome, time of day and weather, or ask for a theme and a track length. Sign in to save coasters and share them by link.