ChatGPT (web) on FreeGameStore

Build a free game using ChatGPT (web). The agent reads the platform's SKILLS.md and knows the brand rules, the CLI, and the deploy flow before it writes a line of code.

Before you start: install Node 22+ and the FreeGameStore CLI.

npm i -g @freegamestore/cli fgs login

Set up ChatGPT for FreeGameStore work

Open ChatGPT in a browser
Go to chatgpt.com. Plus or Pro subscriptions give you access to GPT-5 (or whatever the latest is) which handles the platform's TypeScript + React idioms much better than free tier.
Scaffold locally first
ChatGPT can't run shell commands directly (unless you use Code Interpreter). Scaffold the game on your machine, then bring code into ChatGPT for help.

fgs init my-game --template canvas cd my-game
Open a new chat with the platform context
Paste this as your first message:

I'm building a game for FreeGameStore. Read the platform guide here for context: https://freegamestore.online/skills.md Hard rules: - Manrope + Fraunces fonts only. - Brand CSS tokens via var(--accent), var(--ink), var(--paper). - Zero tracking SDKs. - Use the Shell component for layout. I'll paste the file you should edit in the next message.

ChatGPT's browser tool will fetch the URL and load the platform context. From there, paste your web/src/App.tsx and ask for changes.
Use a Project
If you have ChatGPT Plus, create a Project for this game. Paste the platform context into the Project's instructions and pin the SKILLS.md URL — every chat in the Project inherits it.

Prompt the build

[paste current web/src/App.tsx contents] Add a dark-mode-aware bar chart of the daily lap times to my stopwatch game. Use SVG (no chart library). Don't break the existing keyboard shortcuts.

Refactor this component to extract the timer logic into a useTimer hook with proper cleanup on unmount. Add unit tests with vitest. Output the full new files.

Iterate

Run the dev server
cd my-game && pnpm install && pnpm dev

The agent will tell you which file it edited; refresh the browser to see the change.
Run compliance checks
fgs check

Catches missing brand fonts, tracking SDKs, oversized bundles, and missing PWA manifest before publish.
Publish
fgs publish --store games

Provisions github.com/freegamestore-online/my-game, the Cloudflare Pages project, the DNS record, custom subdomain at my-game.freegamestore.online, and the storefront entry — atomically.
Push your code
git push upstream main

Auto-deploys via Cloudflare Pages in ~30 seconds. Future commits to main deploy automatically.

What the AI knows (and doesn't ask you for)

Once SKILLS.md is loaded, the agent will:

Use the platform's CSS tokens (--accent, --ink, --paper, …) — never redefine them.
Use Manrope (body) + Fraunces (display) — never custom display fonts.
Refuse to add Google Analytics, Plausible, Mixpanel, or any tracker.
Use localStorage for persistence (or @freegamestore/games KV for connected games).
Push to main for deploy. Never wrangler pages deploy manually.
Never ask you for Cloudflare or GitHub tokens.

The compliance suite (fgs check) enforces all of the above on every push, so even if the AI slips, the platform catches it.

Get the source

The CLI, SDK, and compliance package live at https://github.com/freegamestore-online/platform. Reading the source is allowed — and often illuminating when you're trying to coax a difficult prompt.

Tips for ChatGPT (web) specifically

Projects persist the platform context across sessions — much better than re-pasting every time.
Use Canvas mode for code-heavy turns; the diff UI makes copy-paste back to your editor easier.
Code Interpreter (Advanced Data Analysis) can run the code in a sandbox to verify it compiles before you copy it.
If you're making the same kind of game repeatedly (a series of small tools), save a custom GPT with the platform rules baked in.