HELIX 3 Documentation
The unified SDK and platform reference for building virtual worlds on HELIX — across web and Unreal Engine.
HELIX is an engine-agnostic virtual-world platform. You build a world once against a single SDK and HELIX gives you identity, the LIX economy, storage, inventory, social, voice, and multiplayer — then runs it on any device from a single link.
These docs are organized around one idea:
One platform, two runtimes — not two products
The Platform API is engine-agnostic and documented once. The Web SDK (TypeScript) is the canonical contract; the Native (Unreal) SDK mirrors it 1:1 in C++, Blueprint, PuerTS, and UnLua. The same function names mean the same thing everywhere.
Start here
What is HELIX 3?
The product, the mental model, and how the pieces fit together.
Quickstart
From zero to a published, playable world in a few minutes.
Platform vs Engine SDK
The single most important concept in these docs.
Choose your runtime
Web or Native (Unreal)? Pick a path.
The map
Platform API
Engine-agnostic: Authentication, LIX & economy, Cloud Save, Memory Store, Inventory, Social.
Web SDK
TypeScript runtime + web-only multiplayer & networking.
Native (Unreal) SDK
C++ / Blueprint / PuerTS / UnLua against the same API.
Guides
Task-oriented recipes, with side-by-side runtime examples.
CLI & AI tools
helix create / dev / deploy, and the MCP server for AI agents.
Feature matrix
Exactly what's available in each runtime.
Built for humans and agents
Every page in these docs is available as clean Markdown for LLMs — append .md-style content
routes, or pull the whole corpus:
/llms.txt— a structured index of every page./llms-full.txt— the entire documentation as one Markdown file.- Use the Copy Markdown button at the top of any page to grab that page for an AI agent.
We expect most worlds to be built by AI coding agents calling this SDK. The docs are written to be read by both.