I Built a Full PWA Game in One Day with Claude Opus 5.5 and Claude Code (Here Is the Real Token Cost & Harness Setup)

A build log of a Canvas platformer made in one day with Claude Code and Opus 5.5, using vanilla ES modules, WebAudio and a service worker. The author credits a harness of rules and checks, made sprites and animation clips with image and video models, cleaned them into WebP spritesheets with a Python script, and playtested with a Playwright bot. Token use is an estimate.

Disclosure Promotes the author's own game (play and source links)