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Make a multiplayer game with ChatGPT

Connect ChatGPT to Rally Studio once. Then describe a game: ChatGPT builds it on Rally’s multiplayer engine, playtests it with bots, publishes it when you say so, and your friends play it from a link.

Connect ChatGPT

Rally Studio’s address

https://rally.place/api/mcp
  1. In ChatGPT’s settings, turn on Developer mode (not every plan has it).
  2. Open Plugins, choose + and then Add custom MCP server.
  3. Name it “Rally Studio”, paste Rally Studio’s address (above) as the server URL, keep OAuth sign-in, and create it.
  4. Sign in to Rally (it’s free), check what ChatGPT may do, and choose Allow. In a chat, type @, pick Rally Studio and describe your game.

Stuck? The docs walk through it with pictures.

Then say what to make

Be specific about players, the goal and the feel. When you like it, say “publish it” and share the link ChatGPT gives you.

Make a 2D platformer race on Rally for 4 players with coins, moving platforms and a timer. Show a leaderboard at the end of each round.

Or start from a ready-made template.

The whole guide Docs

Games people are playing

Questions

Which ChatGPT plans can do this?
Plans with Developer mode can add custom MCP servers. ChatGPT shows Developer mode in its settings when your plan has it.
Does it work in Codex?
Yes: add Rally Studio as an MCP server in Codex with its address. The docs have the exact setting.
Can ChatGPT see my other games or my messages?
No. ChatGPT only works on the games you own or collaborate on, with the permissions you allowed, and never sees your messages on Rally.
Is it free?
Yes. Making, publishing and playing games on Rally is free; your AI app runs on the plan you already have with it.
Do my friends need an account to play?
No. Anyone can play a published game from its link, right in the browser.