Codex, inside the ChatGPT desktop app, works directly on files in a project folder. You describe what you want in plain English and it builds it, so you don't need to know how to code.
Here's how to build a game with it, the prompt to paste, and what to check first.
What you get
- A working browser game built from one prompt (the video builds a cookie shop game in about three minutes).
- Changes by asking: say what to add and Codex edits the same project.
- Three agents at once, each on its own copy of the project, so you can compare and keep your favorite.
- Reusable skills, plus a hand-off to Codex Cloud once the project is on GitHub.
Free, for your email
Get the full setup steps + the copy-paste setup prompt
The rest of this guide (5 more sections, 1 copy-paste prompt) opens right here. The setup prompt, one paste into Claude that sets it all up, comes by email only. Use your real address.
Unlocks: Step 1: open Codex · Step 2: build the game with one prompt · Step 3: change it, then try three at once · The catch · Sources
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