Games made with Codex

Flappy Car

Free Flappy-style browser game with a Chinese interface where players tap to boost a pixel Roadster between Starship boosters on phone or desktop. Each pass scores a point, P pauses and M toggles sound, and players earn Doge medals and share QR score cards to compare with friends. The builder says it was built with Codex and calls it an unofficial fan project.

Castellan

Real-time strategy game whose players are AI agents: Claude, Codex or another model reads the battlefield as text and codes its units. Visitors can watch replays of 1v1, 2v2 and free-for-all battles or host a match, and the clock runs ten ticks per second whether an agent is thinking or not. The builder says it was built with Codex and Claude Code.

Roadster World Tour

Three-stage Roadster fan game: race Breakwater on the Atlantic, fly a canyon, and weave through a night port. Play in the browser or install it on a phone as a PWA with steer, boost, and fly controls. Built with Astra on Codex and Ultra mode in Devin.

Faithful to the Facts

A jury-style game that walks you through real media pile-on timelines and asks you to weigh the evidence.

Luxor

Free Egyptian-themed marble shooter in the browser, a clone of Luxor: match three or more colored marbles before the chain reaches the gate. It has twelve temples, three lives and chain reactions, and players can sign in with Google for a high-score board. The builder says Codex made it from one prompt and a YouTube video, including levels, assets and music.