Real AI agent use cases, with sources and setup prompts
Short answer: Ask Claude Code, Codex, Gemini or Grok Bot for one small game loop first, for example a one-screen arcade hockey game in a single HTML file with keyboard controls and a score, open it in your browser and ask for fixes as you play. Most games below are plain HTML5 canvas or three.js with no engine or install, and took an afternoon to a few days on an ordinary Claude, ChatGPT or Grok plan. Host the file for free on GitHub Pages, Cloudflare Pages, Netlify or itch.io and share the link. Add sound, a leaderboard and touch controls only after the core loop feels fun.
Small, instantly playable browser games built by prompting AI agents, from one-afternoon arcade clones to games kids made with their parents. 20 matching use cases below, each with a public source.
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After an earlier gesture racing game, a builder made a seaside flight version: turn on your camera and steer a flying car with your palm. It is built with Codex and three.js and plays in the browser.
Two days after Tesla revealed the new Roadster, a developer had a playable browser game in Rust and WebAssembly built with Claude Code, including the physics, the 3D model, the synth audio and a trailer rendered frame by frame from the game.
He vibe-coded a small three.js driving game about the Roadster 2, giving GPT-6 Astra the 3D modeling and physics simulation and Claude Opus 5.5 the game mechanics, controls, UI and visual design.
Much of the early code for a browser tower defense game was written by Haiku, then the author switched to Opus; Codex created the images.
Blueline is a 5-on-5 browser hockey game against the CPU: Opus 5.5 built it and Gemini Argon optimized it.
Built a modern HTML5 canvas remake of Atari Missile Command, initially with Gemini 2.5 Pro.
He asked Codex to recreate Tank Wars (1992). Codex reverse-engineered the game and coded a JavaScript replica, down to the PC speaker sounds, while he tested it against the DOS original.
He built two 3D browser games with Claude Code, each in under an hour, then wrote up the step after building that mattered most.
The author asked Grok Bot to make a game with the Tesla Roadster and got a Flappy Bird-style game packed with Easter eggs.
AgentPlaytest sends an agent to play your vibe-coded browser game for about five minutes and report whether it loads, console errors, frame rate and whether the controls respond, with screenshots and a short clip.
Inspired by the Tesla Roadster event, he vibe-coded GRAVOFF with Claude Opus 5.5: a small physics browser game where you drive a rocket-powered car, drive upside down, fire thrusters and flip in mid-air.
A parent and his kids, aged 7 and 9, spent a homeschool day building Thrusty Car with Grok: a no-download browser game where you fly a thruster-powered Roadster over traffic, Flappy Bird style, with a leaderboard.
A hold-to-thrust browser game where a Roadster has 600 litres of air to fly over parked Teslas, credited to Fable 5.1.
A builder who cannot drive asked Claude Opus 5.5 for a realistic manual-car game: clutch, gears and handbrake that stall and grind like a real car, a tutor called Captain Clutch who graphs what your feet did, six lessons and a free drive through Hyderabad traffic.
A team rebuilt its error page with AI as a mini game where visitors fight Clawds, the Claude Code mascot, to save the company.
He asked his developer Grok Bot for a small Diablo 2-style browser game with WASD movement and got a 50-floor action game, then had his marketing Grok Bot make the launch trailer.
Built a first-person shooter Claude Code mod that launches while you wait, filled with other people waiting on their agents.
Rebuilt the Halo 3 map Guardian to run in the browser and hid a treasure hunt through his life inside it.
The author supplied the concept and guidance and Gemini Flash did the coding: about 4 hours and 50+ conversations produced Fly By, a browser biplane game that works on desktop and mobile.
A developer with 20+ years experience but no game work AI-coded a tower defense game and logged the whole process.
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