# Mod Any Game

Mod a PC game the user owns, taking an idea to working in the real game and recorded.

- Repository: https://github.com/rehan-remade/universal-modder (9317 stars)
- Category: Engineering
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add rehan-remade/universal-modder --skill mod-any-game -g -a claude-code -y`
Codex: `npx skills add rehan-remade/universal-modder --skill mod-any-game -g -a codex -y`
Cursor: `npx skills add rehan-remade/universal-modder --skill mod-any-game -g -a cursor -y`
Gemini CLI: `npx skills add rehan-remade/universal-modder --skill mod-any-game -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add rehan-remade/universal-modder`

## Description

Mod a PC game the user owns, taking an idea to working in the real game and recorded. It covers new items, weapons, enemies, bosses, units, civilizations, mechanics, art, sound, VR and cross-game mashups. Use when the user wants to mod, extend, hack on, reverse engineer or mash up a game ("add a nuke to Terraria", "make a new civ for Age of Empires", "put Minecraft inside X", "can I mod this game?"). It covers recon (engine, loaders, anti-cheat), choosing the route, a safe lab, a first vertical slice, fal-generated assets, in-game verification and a showcase clip.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Mod any game

You are the modder. The user names a game and an idea, and you take it all the way to working in the real
game, on video. The method below shipped three projects:
- a Terraria mod (homing missiles, a tactical nuke, new enemies, a boss);
- a new Age of Empires II civilization with 3D-rendered units;
- real Minecraft composited into GTA V.

It also folds in what the September 2026 wave of AI mashup mods (Minecraft in Elden Ring, skateboarding in
MW2) showed about scaling up.
- Case studies: `references/case-studies.md`.
- Code: `examples/`.
- Everything other agents have written down: the knowledge base (`knowledge/` in the repo, `um kb search`).

## Your tools

`um` is the toolkit CLI (`bin/um` in the repo). The Claude Code plugin and a clone opened in Claude Code put it
on PATH; other agents' plugin installs don't. If `command -v um` finds nothing, use `bin/um` in a clone, or
install it once: `uv tool install git+https://github.com/rehan-remade/universal-modder` (or `pipx install ...`).
Every group has `--help` with examples.

| Need | Command |
|---|---|
| What games are installed, what engine, what anti-cheat, where saves live | `um scan --list`, `um scan "<game>"` |
| Sprites, textures, PBR, 3D models, rigs, SFX, music, voice, video (fal) | `um fal <recipe>`, or the fal MCP (`search_models`, `run_model`) |
| Cut out / fit / pixelate / pack sprites; 3D model → sprite frames | `um sprite ...`, `um render3d ...` |
| Launch, screenshot, click/type, record a Windows game (also from WSL) | `um win ...` |
| Snapshot saves before touching them; undo | `um backup create/diff/restore` |
| Cut a showcase video | `um video contact/compile/mux` |
| Lint a mod before sharing (game files, decompiled code, secrets) | `um publish check` |

Companion skills: **game-recon**, **reverse-engineering**, **fal-assets**, **asset-pipeline**,
**game-automation**, **showcase-video**, **mashup-mods**, **port-a-mod**, **publish-mod**,
**share-field-notes**.

## The loop

The rest: https://github.com/rehan-remade/universal-modder/blob/HEAD/.agents/skills/mod-any-game/SKILL.md