Patchworld
A GTA-style open world built on the real map of San Francisco, where everyone you meet is a real person at the hackathon.
Core trick
A Game Master agent reads player profiles, pairs two people, and sends both to the same GPS-guided street corner.
Description
A GTA-style open world built on the real map of San Francisco, where everyone you meet is a real person at the hackathon. Walk, drive, jetpack or ride a rooftop elevator through a cartoon SF built from real street data. Walk up to another player and swap cards to see their name, what they’re building and what they’re looking for, with a one-click link to their LinkedIn. Gemini 4 Argon runs the city’s social life:
AI citizens (a burned-out staff engineer feeding pigeons, a delivery robot with feelings, a cable car gripman) talk in character about real nearby places using Google Maps grounding, and hand out quests.
A Game Master agent, built on Gemini Managed Agents, reads everyone’s profile, works out who should meet, and sends both people on a GPS-guided quest to the same street corner.
It’s a game where the side quest is your next co-founder.
Built with: Gemini 4 Argon (Maps grounding and Managed Agents), Google Maps Platform (live minimap and Routes API directions), OpenStreetMap, three.js, Rapier physics, Socket.IO multiplayer, SomaFM radio, and Cloud Run.
README excerpt
# Grand Tech Auto: San Francisco **An open world where the side quest is your next co-founder.** ▶ **Play:** https://grand-tech-auto-sf.vercel.app (no install, works on phones) A GTA-style open world on the real map of San Francisco, where the other people walking and driving around are real people at the event. Walk up to someone and swap cards to see who they are, what they're building and what they're looking for, with a one-click link to their LinkedIn. Gemini 4 Argon runs the city's social life: AI citizens who know the real neighborhoods, and a Game Master agent that works out who should meet and sends both of you to the same street corner. Built at the Gemini 4 Argon SF Hackathon (Cerebral Valley × Google DeepMind). ## What you can do - **Explore real San Francisco.** A cartoon-style downtown built from real OpenStreetMap buildings and streets (press **V** for Google's photoreal 3D city instead). Walk up the hills, jump and climb onto ledges, fly a jetpack, ride an elevator to any rooftop, and drive physics cars with real suspension. - **Meet people for real.** Every player is a person at the event. Press **E** near someone, they press **E** back, and you both get each other's card with **Connect on LinkedIn**. Contacts export to CSV or vCard so you actually follow up. - **Talk to the city.** AI citizens (a burned-out staff engineer feeding pigeons, a delivery robot with feelings, a cable car gripman…) answer in character about real places nearby, using Gemini 4