FreeGlyph Runner
ArcadeSample
An endless runner where the track is written as you go.
CodexBrowseritch.ioGitHubEnglish
4.4/5itch.ioAna Reyes
No download needed
Visit official siteOpenAI · Agentic coding tool
Games Made with Codex
OpenAI's coding agent, available as a CLI, IDE extension and cloud agent. Used for delegated tasks such as implementing features or writing tests in parallel.
- Games
- 21
- Used as primary tool
- 16
- Solo developers
- 8
- Engines
- 15
Engines & frameworks
- Three.js3
- Unity3
- Not disclosed2
- Phaser2
- Not disclosed (browser 3D)1
- Not disclosed (HTML5)1
- Vanilla JavaScript1
- None (single HTML file)1
- None (HTML/JavaScript)1
- Custom WebGL engine1
- Godot1
- Phaser 31
- Cocos Creator1
- React (web app)1
- Godot 41
Platforms
- Browser12
- itch.io6
- Steam4
- GitHub3
- TapTap1
All Codex games
Sorted by trending. Open a game to see exactly how the tool was used and the source for that claim.
Free
FreeOrbit Gardener
Puzzle · CasualSample
Plant seeds on tiny planets with real gravity.
CodexTapTapBrowserEnglish
8.9TapTapLi Wen
No download needed
Visit official site
$9.99Riftline Racer
Racing · ArcadeSample
Arcade racing through tracks that rewrite themselves.
Claude CodeSteamEnglish
77%SteamTwo Lane
Download required
View on SteamFree
Wordsmith Arena
PuzzleSample
One daily word duel against the whole internet.
CodexBrowserEnglish
No ratings yetMaya Iyer
No download needed
Visit official site
FreeMoonlight & Mayhem
Action · CasualThe Raccoon Heist prompt, rebuilt by OpenAI Codex.
CodexBrowserEnglish
No ratings yetSimon Willison
Plays instantly in the browser
Play free — official site
FreeThree.js Quake
Actionid Software's Quake, ported to JavaScript and Three.js with Claude Code.
Claude CodeBrowserGitHubEnglish
No ratings yetmrdoob
Plays instantly in the browser
Play free — official site
FreeHacker Story
SimulationA browser simulation game whose code was largely written with AI tools such as Claude Code and Codex.
Claude Codeitch.ioEnglish
No ratings yetevildojo
Plays instantly in the browser
Play free — itch.io
FreeKnight Slaying Dust Bunnies
Arcade · ActionA browser platformer built in one evening inside an OpenAI Codex session.
CodexBrowserEnglish
No ratings yetSola Fide Technologies
Plays instantly in the browser
Play free — official siteFree to play
WenWare
PuzzleViralTrending
Look around a 360° historical scene, then guess when and where it happened.
CodexBrowserEnglish
No ratings yetunderpaid mom
Plays instantly in the browser
Play free — official site
FreeHex Reverse
Card Game · StrategyTrending
A roguelike deckbuilder where cards fight for territory on a hexagonal grid.
CodexSteamEnglish
52%SteamIsaoWorks
Download required
View on Steam
FreeCaldra
Card Game · StrategyA free online PvP deckbuilder where you trade cards for coins mid-match.
CodexSteamEnglish
66%SteamDolphin Star
Download required
View on Steam
FreeNova Lancer
Action · ArcadeA short vertical-scrolling shmup whose code, art and music were made by Claude and Codex.
Claudeitch.ioEnglish
No ratings yethiyaman
Plays instantly in the browser
Play free — itch.ioFree
Gothicvania Codex
ActionA short 2D platformer demo built with Codex CLI and no hand-written code.
CodexBrowserGitHubEnglish
No ratings yetacatovic
Plays instantly in the browser
Play free — official site
$12.99Rip N Ship Simulator
Simulation · CasualOpen card packs on stream, ship orders and grow a basement card shop.
CodexSteamEnglish
90%SteamCopixel Studios
Download required
View on SteamFree
Mini-Loot
RPG · StrategyA small turn-based auto-battler in the browser, built by GPT 5.5 in Codex.
CodexBrowserEnglish
No ratings yetCharles Berube
Plays instantly in the browser
Play free — official site
FreeNothing Special: A Shooting Game
Action · ArcadeA side-scrolling pixel bullet hell whose code was generated by Codex.
Codexitch.ioEnglish
No ratings yetnekodaman
Plays instantly in the browser
Play free — itch.ioFree
FlapGPT
ArcadeA Flappy Bird-style Game Boy Color game built with OpenAI's Codex.
CodexBrowserEnglish
No ratings yetOpenAI × ModRetro
Plays instantly in the browser
Play free — official siteFree
Void Explorer
Simulation · AdventureTrending
Fly from orbit down to a planet's surface — an OpenAI demo game built in Codex.
CodexBrowserEnglish
No ratings yetThomas Ricouard
Plays instantly in the browser
Play free — official siteFree
Paper Glider
Arcade · CasualSteer a paper airplane through procedurally generated rooms, an OpenAI Codex showcase demo.
CodexBrowserEnglish
No ratings yetKatia Gil Guzman
Plays instantly in the browser
Play free — official site
Free demoSecond Tail
Adventure · ActionTwo pet rats try to find their way home through a rainy city.
Claudeitch.ioEnglish
5.0/5itch.iopara1992
No download needed
View demo on itch.io
FreeCream's Cozy Cottage
Simulation · CasualCare for a cat and merge materials into beds and toys for a small cottage.
Codexitch.ioEnglish
3.5/5itch.ioCream's Cozy Cottage
Plays instantly in the browser
Play free — itch.ioOther AI tools