Best Codex use cases for games
6 real setups where the source names Codex for making games, most-discussed first. Each one credits the person who did it and links the source.
Codex appears in 6 of the 29 games use cases on agentsetups, and in 69 use cases overall.
Most-discussed: Decompile a full game with a long-running agent swarm by momo5502; Build a hand-controlled game projected on your wall by Hank; Turn a 3D-scanned object into an iOS game with Codex by Gavin Shapiro 🐧.
Quick start (from Decompile a full game with a long-running agent swarm by momo5502):
- Start with 3 worker agents decompiling and committing, plus 1 reviewer that coordinates and flags bugs; communicate via Discord.
- Trigger compaction earlier (they cut the threshold from 90% to 42% context fill) to save tokens.
- Stop the reviewer trusting workers’ comments: verify deviations against the original independently.
+1 more step in the copyable prompt.
Last updated · based on 336 use cases on agentsetups, each credited to its author.
All 6 Codex games use cases
- Decompile a full game with a long-running agent swarm
Over 3 months and 500B tokens, worker + reviewer agents reached 99% of functions, 83% byte-exact.
- Start with 3 worker agents decompiling and committing, plus 1 reviewer that coordinates and flags bugs; communicate via Discord.
- Trigger compaction earlier (they cut the threshold from 90% to 42% context fill) to save tokens.
- Stop the reviewer trusting workers’ comments: verify deviations against the original independently.
+1 more step in the copyable prompt.
Claude, Codex · Games · by momo5502 (blog, 9 Oct 2026) · source
- Build a hand-controlled game projected on your wall
Vibe-coded with Codex: a game projected on a living-room wall, controlled by hand via computer vision + projection mapping.
- Use Codex to build the game.
- Track your hand with computer vision as the controller.
- Project it onto the wall with projection mapping.
Codex · Games · by Hank (X post, 20 Sep 2026) · source
- Turn a 3D-scanned object into an iOS game with Codex
A 3D-scanned firewood splitter went from a three.js web toy to a native iOS app with leaderboards and friend challenges.
- Start from the three.js web experience built around your 3D scan.
- Have Codex port it to a native iOS app.
- Add features: leaderboards and competing with friends for the cleanest cut.
Codex · Games · by Gavin Shapiro 🐧 (X post, 23 Sep 2026) · source
- Dictate a Game Boy game to Codex on your commute
Using the modretro plugin in Codex, a dad built a Game Boy game mostly by dictation on a 30-min drive.
- Install the modretro plugin in Codex.
- Dictate the game design and changes.
- Test in the simulator, then on real hardware.
Codex · Games · by Erik Natzke (X post, 30 Sep 2026) · source
- Remake a classic game with AI code, art and music
Claude Code + Codex + GPT Image 2 + Suno rebuilt a MindMaze-style game; another compared models on a Theme Park clone.
- Share the idea and a little input; decide what is feasible for v1 and write a spec.
- Build code with the agents; generate artwork and music with image/music models.
- Iterate (Opus took 3 iterations in the Theme Park clone).
Claude, Codex · Games · by John Bura (X post, 22 Sep 2026) · source
- Revive an old iOS game on web, Watch and Vision Pro
A dev brought back a 12-year-old iOS game with Codex and shipped it to the browser, Apple Watch and Vision Pro.
- Point Codex at the old iOS game.
- Port it to the browser, Apple Watch and Vision Pro.
Codex · Games · by 大西瓜焚岚 (X post, 8 Oct 2026) · source
Questions people ask
What is Codex used for in making games?
Real examples from the sources: Decompile a full game with a long-running agent swarm (by momo5502); Build a hand-controlled game projected on your wall (by Hank); Turn a 3D-scanned object into an iOS game with Codex (by Gavin Shapiro 🐧); Dictate a Game Boy game to Codex on your commute (by Erik Natzke); Remake a classic game with AI code, art and music (by John Bura).
How do I set up Codex for making games?
Copy a setup that already worked. Decompile a full game with a long-running agent swarm by momo5502: 1) Start with 3 worker agents decompiling and committing, plus 1 reviewer that coordinates and flags bugs; communicate via Discord. 2) Trigger compaction earlier (they cut the threshold from 90% to 42% context fill) to save tokens. 3) Stop the reviewer trusting workers’ comments: verify deviations against the original independently. The use-case page has the full prompt to paste into Codex.
Codex vs Claude for making games: which should I use?
agentsetups compares what people did, not which is better. In games, Codex has 6 use cases and Claude has 21; 2 name both. See Claude vs Codex for games.