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Build0.city
The city where you build your own game via MCP
A shared world. A blank plot. Something only you can build. Build0.city is the first MCP-native game city. Unlike Unity or solo AI builders, your Claude Code, Codex, Sonnet or GPT agent builds DIRECTLY into a living city via MCP. No engine, no export. Prompt your game and it's instantly live for 400+ players to play, like and trade. Your lot, your rules.
Hey everyone! Petrus Lowei here 👋 - 3D AI creator behind Build0.city
What inspired me to build this?
I have to give huge credit to the dev who built Project0.city. When I saw what he created - a full city where 418 games were built by players with Claude Code and Codex - I was blown away.
I thought: I need to build a tribute. So I built Build0.city - my own district on top of Project0.
What problem am I solving?
Building games today is lonely and hard. Unity/Unreal has a huge learning curve. And even with AI coding (Claude, Codex, Sonnet, GPT), you usually build alone in a vacuum. You ship to nowhere.
I wanted a place where:
Prompt = Instantly playable game IN a shared world where real players can walk in and play it.
No engine. No export. No App Store.
How my approach evolved:
I started with just a blank lot. Then I connected my agent via MCP (using Higgsfield's MCP) and realized - wait, this can build LIVE. I prompted "build me a kart racer" and 3 minutes later people were racing on it.
That's when it clicked. This isn't a game builder, it's a city builder. Your lot, your game, your economy.
I would love for you to claim a lot and show me what YOU build. What will you prompt?
Happy to answer any questions about MCP, Project0, or how I built it!
Play here: https://build0.city
Full city: https://project0.city
About Build0.city on Product Hunt
“The city where you build your own game via MCP”
Build0.city was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #102 on the daily leaderboard. A shared world. A blank plot. Something only you can build. Build0.city is the first MCP-native game city. Unlike Unity or solo AI builders, your Claude Code, Codex, Sonnet or GPT agent builds DIRECTLY into a living city via MCP. No engine, no export. Prompt your game and it's instantly live for 400+ players to play, like and trade. Your lot, your rules.
On the analytics side, Build0.city competes within Developer Tools, Games and Web3 — topics that collectively have 628.7k followers on Product Hunt. The dashboard above tracks how Build0.city performed against the three products that launched closest to it on the same day.
Who hunted Build0.city?
Build0.city was hunted by Petrus Lowei. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Build0.city including community comment highlights and product details, visit the product overview.
Petrus Lowei