Built Tetris inside ChatGPT using Vercel's ChatGPT App Template + OpenAI Apps SDK

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Screenshot 2026-01-03 at 11.59.08 PM
Screenshot 2026-01-03 at 11.59.08 PM1920×1068 263 KB

I built a fully functional Tetris game that runs entirely inside ChatGPT conversations. You can take a gaming break mid-chat without switching tabs.

Demo: https://youtu.be/o8TcjEXU7yM
Code: https://github.com/sholajegede/chatgpt-tetris

Built with Vercel Technologies

Framework & Infrastructure:

Integration:

  • OpenAI Apps SDK for ChatGPT widget integration

  • MCP (Model Context Protocol) server with OAuth2 security schemes

  • Custom JWT verification with JWKS discovery

Data & Auth:

  • Convex for real-time database and game state persistence

  • Kinde for OAuth authentication

  • Replay recording system for playback

Key Features

  • Full Tetris Mechanics - 7 pieces, rotation with wall kicks, line clearing, scoring system

  • Persistent Game State - Your games save automatically with replay recording

  • Global Leaderboards - Compete with other players

  • Seamless Integration - Play without leaving your ChatGPT conversation

  • OAuth Support - Anonymous play or authenticated with profile

Tech Stack Highlights

  • Frontend: Next.js + TypeScript

  • Backend: MCP server + Convex (https://convex.dev)

  • Auth: Kinde OAuth with custom JWT validation (https://kinde.com)

  • Deployment: Vercel (template handled all the boilerplate)

  • Build time: ~4 hours

The Vercel ChatGPT app template was a game-changer (pun intended), it handles all the MCP setup, widget scaffolding, and deployment config.

Would love feedback from the community on the implementation or ideas for what to build next with the Apps SDK!

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News Cache (2026-01-12)
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Thanks for your contributions, @shola!

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Thanks! I decided to try building another ChatGPT app, this time using v0, and it absolutely nailed a snake game in just 9 prompts. I’m writing a post about it tomorrow,I had no idea v0 was capable of that.

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