Browser Games Made with Codex

Look around a 360° historical scene, then guess when and where it happened.

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Shopping-cart racing at rocket speed through a haunted supermarket — second place at Vibe Jam 2026.

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Grow, prune and shape a living bonsai tree in a calm 3D garden in the browser.

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Fly from orbit down to a planet's surface — an OpenAI demo game built in Codex.

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A Chinese-language pixel life sim with branching timelines, mostly coded with Codex.

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An old-school text-based MMORPG in the browser where your character keeps progressing while you're offline.

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A three-lap browser kart racer against six rivals, coded by Claude in Claude Code.

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A short 2D platformer demo built with Codex CLI and no hand-written code.

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A cute, funny life-sim card game: draw picture cards instead of spinning a wheel, and choose how your life goes.

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Steer a paper airplane through procedurally generated rooms, an OpenAI Codex showcase demo.

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A browser platformer built in one evening inside an OpenAI Codex session.

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A small turn-based auto-battler in the browser, built by GPT 5.5 in Codex.

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The Raccoon Heist prompt, rebuilt by OpenAI Codex.

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id Software's Quake, ported to JavaScript and Three.js with Claude Code.

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A Flappy Bird-style Game Boy Color game built with OpenAI's Codex.

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A real Famicom/NES game about running a chip fab from 1971 to AI superintelligence, wrapped for phone browsers. The developer says it was built entirely inside the Codex app, and lists Codex on the team.

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A map-based WWII submarine sim set in the Pacific: plot contacts, estimate range with a stadimeter and build firing solutions by hand. The developer says Codex wrote all of the code.

No download needed

Tap machines to make screws, grow a factory and launch rockets across six stars in this free browser idle clicker; its developer says Claude Code implements it and Codex reviews.

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A one-minute phone game about stamping five approvals on a fictional request form, each tilted in a bow toward the president. The developer says the code was written with OpenAI Codex and Claude Code.

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A free first-person team spellcasting battle in the browser: three orders of mages guard their shrines and try to break the others'. The developer says Claude Code writes almost all of the code.

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A short tap-to-explore settlement game on a new planet, built mostly with Codex; zoom out from the 2D map to a 3D globe.

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A 3D browser roguelite: a small brass machine with a sword, a gun and a laser cuts its way out of a castle-machine.

No download needed

Run an unlicensed basement surgery for aliens: saw, cut and electrocute for money. Vibe Jam 2026's “Most Cursed” award.

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A free browser physics merge game with original creatures and cross-species fusion recipes; the developer says it was made entirely with Codex over a weekend, logo and sound effects included.

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Clay cavemen fight, gather resources and race to haul them back to their caves first.

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A traditional ASCII roguelike with a long quest line, a large world map and old-school D&D-style races, classes and spells.

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Fast drone combat in escalating waves, with boss waves, missions and a hangar of permanent upgrades between runs.

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A surreal office shooter: a burned-out worker blasts a way out of a collapsing corporate nightmare.

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An unofficial Halo 3 fan project that turns the Guardian map into a playable personal website, with a treasure hunt through the developer's life; Codex wrote essentially all of the code.

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A free multiplayer meme game in the browser: drive, boost and fly a sports car through stunt courses, highways and a neon city. The developer says Codex with the model Astra did most of the work, and Claude Code polished the graphics.

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A small 2D side-scrolling souls-like demo in the browser, with grappling, a day-night cycle and a built-in map and body editor. The developer says it is mostly coded with AI agents (Codex and Claude).

No download needed

A free pixel-art idle survival game in a French valley overrun by the dead: pick what your survivor does and they keep at it while the game is closed. The developer says Claude Code wrote most of the code.

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A reverse Moby-Dick: you are the whale, rising from the deep to break the whaling fleet.

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A cozy multiplayer sheep-farming game in 3D in the browser: build a shelter, raise 12 breeds of sheep, grow crops and share a farm with friends. The developer says GPT 6 Astra in Codex made it one-shot from a single /goal run.

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A point-and-click browser game made for a wedding website: wander ten illustrated rooms, throw a party and take a road trip; the README says AI agents write all the code.

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Toddlers brawl over the TV remote in a giant living room, and nap time is 90 seconds away.

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A free browser arcade of small original games, from a bubble shooter and a brick breaker to a kart racer and artillery duels, playable offline on a phone.

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Play a pirate in 1691 and turn the Caribbean's richest city into chaos with ten brutal weapons.

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A scenic rally race through the Positano region, against the clock or other players.

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A free, open-source survivors-style roguelite starring a cockroach in the sewers, playable in the browser or as a desktop app. The developers say they built it together with Claude Code, Codex and Copilot, spending most of their own time on design and testing.

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A free browser prototype: drive a red roadster through rush-hour traffic and use its jets to hop over oncoming cars; the developer says it was made with Codex, chatting and revising along the way.

No download needed

A Descent-style ship crawler with stealth and roguelike levels, deep inside a hostile asteroid.

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A multiplayer racing sim for a shared screen, where each player's phone becomes a tilt-to-steer controller with haptic and sound feedback.

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A free, open-source first-person 3D city with 40 kinds of jobs, salvage, a pawn shop, a subway and the developer's TikTok videos on its billboards. Created with Codex, per the developer.

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A satirical pixel-art survivor shooter in which caricatured tech founders fight their way to a rogue AI.

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A strategy game played from the alien side: grow a living colony across the moon while human machines try to burn it out.

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A voiced point-and-click adventure about a salt smuggler and his mare in 1844 Slovenia; Act I is free to play in the browser, in Slovenian or English.

No download needed

A cartoon kart racer for one to four players in split screen, with jump ramps, four tracks and an EASY mode that steers for you. Built in Claude Code, per the developer.

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A fast parkour movement shooter with a speedrun gauntlet and a mission where you call in your mech.

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A one-minute card game about putting out a social-media firestorm: match the right response card to each spark before the outrage meter hits 100. The developer says the code was implemented mainly with Codex.

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