AI Game ModsInstall Universal Modder
Pick your agent, use the README commands and check the tools you need.
Independent guides / Single-player PC modding
Universal Modder guides: mod PC games with AI
Learn to mod games with AI coding agents. Start small, follow the source, and test what you build.
What is AI game modding?
You describe a change to a coding agent, which investigates the game and helps build a mod. The work still involves choosing a modding route, preparing assets and checking the result in the running game.
Universal Modder is an MIT-licensed open-source project that supplies agent skills, the Python um CLI and shared field notes. Its documented workflow moves from game reconnaissance and save backups to a working slice, assets and in-game verification. Our guides explain that workflow for single-player games you own.
3 steps to your first mod
01 / PREPARE
Connect your agent
Choose the install route for your coding agent and check the README requirements.
02 / DEFINE
Ask for one change
Let the agent identify the game and search prior notes. Back up saves before making changes.
03 / VERIFY
Try it in the game
Build one working slice, check the real behaviour, then expand the mod and record what you learned.
From the project's showcase
These examples are described in the README. They are project reports; we have not run them ourselves.
- Minecraft × GTA V: Steve glides through Los Santos, the Nether spreads across it, and Minecraft mobs fight the police.
- Halo × Minecraft: the Warthog appears in Minecraft.
- World at War × Minecraft: the showcase features a flamethrower and zombies.
- Terraria — Fal Arsenal: new weapons, enemies and a Drone Mothership boss, with sprites generated through fal.
- Age of Empires II DE — San Franciscans: a civilization with a Robotaxi, Delivery Drones and a Transamerica Pyramid wonder.
- Minecraft inside GTA V: camera, ground and event exchange connects the games; colour and depth combine their frames.
Choose your next step
Merge games with AI
Choose between a content port, a two-game bridge and a rebuilt simulation.
Set up your fal key
Connect fal for asset generation, or explore the local ComfyUI image route.
Frequently asked questions
What is Universal Modder?
Universal Modder is an MIT-licensed open-source project combining agent skills, a Python CLI, asset tools and shared field notes for modding PC games you own.
How do I mod games with AI?
Choose an agent install route, check the requirements, then describe a small change. The project workflow searches existing notes, identifies the game, backs up saves, builds a slice and verifies it in the running game.
Which coding agents are documented?
The README lists Claude Code, Codex, Gemini CLI, VS Code / Copilot, Cursor and OpenCode, plus Skills only and Anything else installation routes.
Do I need a fal API key?
A fal key is used for fal asset generation. For images without that key, the README describes um comfy with a local ComfyUI server.
Are these mods independently tested here?
No. The examples are project reports and the guides follow the supplied research snapshot. We have not tested every game or agent setup.
What kind of modding do these guides cover?
These guides cover single-player modding of games you own. Start with a safe setup, back up saves and verify the result in the actual game.