Overview
Learn how to use Polymerium — from your first instance to advanced modpack development.
Polymerium is a cross-platform, open-source Minecraft launcher built around a simple idea:
Your instance is a recipe, not a pile of file copies.
Instead of duplicating mod files for every instance, Polymerium stores each file once and builds instances on demand. The result: less disk usage, instant switching, and a workflow that actually makes sense for modpack development.
Where to Start
- New to Polymerium? Follow the Getting Started guide — you'll be playing in minutes.
- Coming from another launcher? Check the Migration Guide for a quick transition.
- Curious how it works? Read Core Concepts to understand what makes Polymerium different.
What You'll Find Here
| Section | What It Covers |
|---|---|
| Getting Started | Download, install, create an instance, add mods, play. |
| Core Concepts | The ideas behind Polymerium: metadata-driven instances, four-layer directories, deploy pipeline. |
| Managing Instances | Accounts, import/export, snapshots, tags, Java management, settings. |
| Advanced | Deployment rules, workspace, modpack development, CLI, MCP/AI agent mode. |
| Guides | Step-by-step walkthroughs for specific tasks — no theory, just doing. |