Image: u/lavel0rz on Reddit · A BrowserBall match seen from above
BrowserBall: a real-time 3v3 football game over WebTransport
The maker barely wrote code by hand: Claude Code built a server-authoritative browser football game with client prediction, bots, private rooms and instant replays, playable on PC or phone.
Credits
Earliest dated source:
The full story
BrowserBall is a free top-down 3v3 football game where each player drives a small ship. It runs in the browser on PC or phone, with two control styles, bots for empty slots, private rooms by link, and an instant replay of every goal that can be saved as a clip.
The maker barely wrote code by hand. Their loop was to play, describe what felt wrong, such as the ball rubber-banding on fast passes, and have Claude Code find the cause, measure it, fix it, run the tests and push. The server is authoritative at 120 Hz with client-side prediction, and it uses WebTransport datagrams instead of WebSockets, which fixed head-of-line blocking the maker had hit in earlier attempts.
Claude can't feel latency, so feel had to be described precisely, and mobile controls took several rounds. The server is US-only for now.
How it was done
Tools
Themes
Loading themes…
Sources
From a short post by the maker, so the details are as they tell them.
- Reddit: I built a real-time multiplayer browser football game with Claude Code (server-authoritative, WebTraReddit poster: lavel0rzPosted
The maker's post in r/ClaudeAI on the game and how Claude Code helped.