What if you could turn almost any PC game into something completely different using AI?
And what if Claude Code could handle the modding process for you?
Meet Universal Modder, an open-source collection of AI agent skills and tools designed to make game modding dramatically easier.
Instead of simply asking Claude to figure out how to modify a game, Universal Modder gives it a structured workflow, technical knowledge, and specialized tools.
And the results can get pretty ridiculous.
In just a couple of hours, it helped create a GTA-style mod for SimCity 3000.
Yes, that SimCity 3000. The classic city-building game from 1999.
And it didn't stop there. The workflow also produced a promotional video featuring actual gameplay footage from the mod.
What Universal Modder can do:
- Analyze games and identify their engines and modding possibilities
- Research existing modding techniques and reverse-engineer game systems
- Generate custom sprites, textures, 3D models, and audio
- Build and test modifications inside actual games
- Record real gameplay footage
- Create promotional videos showcasing the results
- Reuse accumulated modding knowledge across projects
It supports Claude Code, Codex, Gemini CLI, Cursor, and other AI coding agents.
The interesting part isn't just that AI can modify old games.
It's that giving AI agents specialized skills and proven workflows can produce much better results than simply asking them to figure everything out from scratch.
A GTA-style mod inside SimCity 3000, complete with its own gameplay trailer, is a pretty entertaining demonstration of that idea.
We're entering an era where modding games might become less about knowing how to code and more about knowing what you want to create.
Universal Modder on GitHub:
https://github.com/rehan-remade/universal-modder
Open source, MIT licensed.
#ClaudeCode #AIGameModding #SimCity3000 #VibeCoding #AIAgents
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