UNIVERSAL
MODDER.
Your games. Your rules.
Turn “what if” into a working mod.
Give your AI coding agent the tools to make it real.
THE GAME DOESN’T
END AT THE CREDITS.
Add a weapon. Build a world. Put one game inside another.
Universal Modder gives AI coding agents a shared set of skills, engine playbooks, and tools to find a modding route, build assets, and test in the real game.
Meet your new modding workflowFind a way in.
Identify your engine, version, and loaders. Start with what already worked.
Make it yours.
Build the code. Create sprites, 3D, and sound with fal or a local image workflow.
See it work.
Test inside the running game. Package the mod and share what you learned.
MODS YOU CAN PLAY.
Three documented examples from the open-source project.
The kind of “what if” you can actually play.
01 GTA V × Minecraft Minecraft. Meet Los Santos.
Real Minecraft rendered inside GTA V story mode. Shared cameras, shared chaos.
02 Terraria A whole new kind of firepower.
Homing missiles, a tactical nuke, and a two-phase boss. Built with tModLoader.
03 Age of Empires II DE Rewrite a little history.
A new civilization. Robotaxis, delivery drones, and a very different wonder.
PICK AN AGENT.
MAKE A MOD.
Same toolkit. The agent you already use.
Install it, point it at your game, and start small.
A coding agent, a game you own, Git,
Python 3.10+, and ffmpeg.
MIT-licensed toolkit. Agent and asset-generation
services may have their own costs.
START IN A WORLD
YOU ALREADY KNOW.
Find a documented route for your game.
Versions matter. Field notes show the details.
Looking for something else? The upstream toolkit includes 12 engine playbooks.
Find your route
BEFORE YOU
PRESS PLAY.
The useful details,
without the guesswork.
01 What is GitHub Universal Modder? +
Universal Modder is the open-source rehan-remade/universal-modder repository. It bundles Agent Skills, a Python CLI called um, engine playbooks, a shared knowledge base, and a fal MCP integration so AI coding agents can inspect PC games, build mods, prepare assets, and verify the result in-game.
02 Is it free to use? +
The toolkit is MIT licensed. Your coding agent or model may have its own costs, and fal-generated images, 3D, audio, or video require a fal account and are billed separately. A local ComfyUI server can provide an alternative image workflow through um comfy.
03 Does it really support every PC game? +
There is no universal compatibility guarantee. Engine playbooks suggest routes, while field notes report what worked on particular versions. A documented working mod is stronger evidence than an engine playbook. Start with a scan and the notes for your exact game and version.
04 Do I need to know how to code? +
You can describe your idea in plain language. You still need to install the tools, understand which files will change, review the agent’s plan, and check the result in the real game. Start with one small change and a separate test save.
05 Can I use it with online games? +
The upstream project supports permitted modding, including single-player games and servers you host. It refuses anti-cheat bypasses, DRM bypasses, and cheats against other players. Use an offline or explicitly supported modding environment and follow your game’s rules.
06 Is this the official Universal Modder website? +
No. This is an independent guide to the open-source project. Installation commands, examples, and status labels are linked to their upstream sources. For current releases, source code, and contributions, use the official GitHub repository.