Build World

Build interactive 3D worlds with high-quality assets from Thrixel and your AI agent of choice.

Claude Code (or your preferred agent) handles the logic, interactions, and scene setup. Thrixel generates, organizes, and manages the 3D assets. Save your coding agent tokens and time by using Thrixel to generate 3D assets faster and at higher quality than Claude Code.

Build World currently supports Three.js, Roblox, Unity, and Unreal Engine. This page covers Claude Code, but the workflow works with other coding agents as well.

Build World was previously called Goal to Game. The name changed because the skill goes beyond games: it can build interactive experiences, simulations, educational experiences, virtual tourism and historical recreations, AR/VR experiences, and more.

Thrixel inside the Gauntlet Loop

Build World uses a gauntlet loop-like iterative workflow for creating interactive 3D worlds. The agent calls Thrixel to generate and refine 3D assets inside the loop. The agent continuously builds, evaluates, and improves the world itself, including its gameplay, interactions, and assets. With Build World, you can vibe out a game or other interactive 3D experience from a single prompt, then keep refining it with follow-up prompts.

Quick start

Steps 1 and 2 are once per machine. After that, a new game is just step 3.

Using Codex or Gemini CLI instead? Each one installs Thrixel its own way - the installation page has the steps for both.

1. Install Claude Code and uv

claude --version
uv --version

Both print a version? Skip to step 2.

Not installed? Install commands here

macOS, Linux, WSL

curl -fsSL https://claude.ai/install.sh | bash    # the agent that writes your game
curl -LsSf https://astral.sh/uv/install.sh | sh   # runs the Thrixel connector

Windows PowerShell

irm https://claude.ai/install.ps1 | iex
irm https://astral.sh/uv/install.ps1 | iex

⚠️ NOW OPEN A NEW TERMINAL, then re-run the check above. Skipping this is the number one cause of command not found.

2. Connect Thrixel with Claude Code Plugins

Same on every platform:

# 1. Sign up and log in. Opens a page with a code, click Approve. The only manual step here.
uvx thrixel-mcp@latest login

# 2. One plugin carries both the skill and the Thrixel connector, for every project.
claude plugin marketplace add thrixel/build-world
claude plugin install thrixel@thrixel

Confirm both pieces landed:

claude plugin list     # thrixel@thrixel -> enabled
claude mcp list        # plugin:thrixel:thrixel -> Connected

Both lines look right? You are done. Go to step 3.

Turn on updates (once). Updates are off by default. In Claude Code:

1. Type /plugin
2. Marketplaces > thrixel
3. Enable auto-update

(Or update manually anytime: /plugin update thrixel@thrixel. Skipped this? No problem, the agent tells you when a newer version is out.)

Installed manually before? Remove the old copies

The plugin includes both pieces, so your old install is now a duplicate. Remove it once.

macOS, Linux, WSL