modlab.Build a brief
INDEPENDENT GUIDE

Universal Modder.Start modding.

An open-source toolkit for AI coding agents. Install it, choose your game, and test one change.

Install Universal Modder Official GitHub ↗

Open source · Claude Code, Codex & more

UPSTREAM SHOWCASE12 SEC · SILENT
Familiar games. Unexpected ideas.

Minecraft crossovers from the project's own showcase.

Source

By Rehan & contributors · upstream footage, not a ModLab test.

New worldsCustom itemsDifferent rules
01 · UNDERSTAND

What is Universal Modder?

Features, requirements and costs.

Tool overview 02 · INSTALL

Set up your agent.

Claude Code, Codex, Gemini and more.

Installation guide 03 · USE IT

Build your first mod.

Step-by-step tutorials and fixes.

Universal Modder tutorials
YOUR SETUP, ONE NEXT STEP

Where should you start?

Choose your game and system. Find the next step for your setup.

Your choices stay in this browser. This helper prepares instructions for your local agent; it cannot access your game or create a playable mod here.

Want to play a showcased mod? Installing the toolkit does not install those mods. Open the specific case for its source and version requirements; check whether it has a release or needs building.

Already stuck? Choose the exact error before reinstalling tools or changing the game.

Mindustry test arena from the Universal Modder practice tutorial
UNIVERSAL MODDER EXAMPLE · TESTED ON MAC

Try a first mod in a free game.

Mindustry homing turret · video, source and agent prompt.

Open the tutorial
UNIVERSAL MODDER TUTORIALS

Install. Build. Troubleshoot.

All tutorials
Getting started

Your first mod with Universal Modder

Understand the workflow, choose a small first change, and know what a working result looks like.

8 min readSource-reviewed
Getting started

Install Universal Modder without guessing

Install Universal Modder for Claude Code, Codex, Gemini CLI, Cursor, Copilot or OpenCode, then check the CLI and optional asset setup.

9 min readSource-reviewed
Troubleshooting

Universal Modder: fix fal key and MCP connection problems

Separate missing FAL_KEY, editor environment and MCP connection problems from the local modding tools, without exposing your API key.

6 min readSource-reviewed
UNIVERSAL MODDER EXAMPLES

Explore the game workflows.

Four source-documented builds. Choose one to study.

All mod cases

Upstream-reported examples · ModLab in-game checks pending for these four cases.

COMMON QUESTIONS

Before you install.

Where do I download Universal Modder?+

Use the official rehan-remade/universal-modder GitHub repository. Choose the integration for your coding agent; installing the toolkit does not install the mods shown in its showcase. ModLab is an independent guide.

Is Universal Modder a one-click app?+

It is a toolkit for AI coding agents. Setup, game-specific dependencies and in-game verification still matter.

Can I use this with any game?+

Engine playbooks describe possible routes, not certified compatibility. Start with a documented example and confirm the exact game and loader versions.

Are these guides tested in-game?+

The Mindustry homing lab was reproduced in Mindustry 160.7 on macOS. It includes a real-game capture and an editable mod. Other guides remain source-reviewed, and upstream examples are separately attributed.

Does using it cost money?+

The toolkit is open source. Agent usage and cloud-generated assets can cost money. Set spending limits and record retries.