by thrixel
Build beautiful games with high-quality 3D assets using Thrixel and Claude Code.
# Add to your Claude Code skills
git clone https://github.com/thrixel/build-worldbuild-world is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by thrixel. Build beautiful games with high-quality 3D assets using Thrixel and Claude Code. It has 59 GitHub stars.
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Clone the repository with "git clone https://github.com/thrixel/build-world" and add it to your Claude Code skills directory (see the Installation section above).
build-world is primarily written in JavaScript. It is open-source under thrixel on GitHub, so you can review or fork the full source.
Yes. SkillsLLM lists many other AI Agents skills you can browse and compare side by side. Open the AI Agents category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh build-world against similar tools.
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Build better Gauntlet Loop games with high-quality 3D assets from Thrixel and your AI agent of choice.
Claude Code (or your preferred agent) handles the game logic 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.
Goal to Game currently supports Unity and Three.js. This page covers Claude Code, but the workflow works with other coding agents as well.
Goal to Game uses a Gauntlet-style iterative workflow for AI game development. The agent continuously builds, evaluates, and improves both gameplay and 3D assets, with Thrixel generating and refining assets inside the loop. With Goal to Game, you can vibe out a game from a single prompt, then keep refining it with follow-up prompts.
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.
claude --version
uv --version
Both print a version? Skip to step 2.
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.
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/goal-to-game
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:
/plugin(Or update manually anytime: /plugin update thrixel@thrixel. Skipped this? No problem, the
agent tells you when a newer version is out.)
The plugin includes both pieces, so your old install is now a duplicate. Remove it once.
claude mcp remove thrixel
rm -rf ~/.claude/skills/goal-to-game ~/.claude/skills/thrixel
claude mcp remove thrixel
Remove-Item -Recurse -Force "$HOME\.claude\skills\goal-to-game","$HOME\.claude\skills\thrixel"
# Run this wherever you keep projects. Claude makes the project folder itself.
claude --permission-mode auto
Into Claude Code (not the terminal), start the line with /thrixel:goal-to-game, then
describe the game and name the engine (three.js or Unity):
/thrixel:goal-to-game build a submarine exploration game in three.js set in a bright, vibrant tropical sea with coral and fish
[!TIP] Type
/thrand Claude completes/thrixel:goal-to-gamefor you, so you never type it in full. If the completion does not appear, the skill is not installed - go back to step 2.
We recommend setting /model to Opus 5 or a more capable model, with effort set to high or above.
Claude checks your Thrixel account and starts building. Keep talking to it in plain English to change things.
Replaces steps 2 and 3 above. Same start command either way: /thrixel:goal-to-game.
2. Connect Thrixel
# 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. Install the Thrixel connector. --scope user covers EVERY project, not just this folder.
claude mcp add --scope user thrixel -- uvx thrixel-mcp@latest
# 3. Install the skill. Clone, not download, so it can update itself later.
git clone https://github.com/thrixel/goal-to-game ~/.claude/skills/thrixel
Same three commands. Only the path differs: ~ is not reliably expanded when PowerShell passes it
to git, and a skill that lands anywhere else is invisible to Claude.
uvx thrixel-mcp@latest login
claude mcp add --scope user thrixel -- uvx thrixel-mcp@latest
git clone https://github.com/thrixel/goal-to-game "$HOME\.claude\skills\thrixel"
Confirm both landed:
claude mcp list # thrixel -> Connected
ls ~/.claude/skills/ # thrixel listed
If either is missing, Claude will build the game without Thrixel and never mention it.
3. Ask for a game
Identical to step 3 above, same command and all:
/thrixel:goal-to-game build a submarine exploration game in three.js set in a bright, vibrant tropical sea with coral and fish
"command not found" - open a new terminal. Fixes it almost every time. If a fresh terminal
still fails, run export PATH="$HOME/.local/bin:$PATH" (PowerShell:
$env:Path = "$HOME\.local\bin;$env:Path").
Claude has no Thrixel tools - check claude mcp list for thrixel. If missing, re-run the
claude mcp add line, then restart Claude.
Claude says you need to sign in - re-run uvx thrixel-mcp@latest login and click Approve. No
restart needed, just tell Claude to continue.
"Out of cubes" - cubes are Thrixel's generation credits. Claude shows you what is built, marks missing assets as labelled blocks, and asks how you want to continue.
Every asset generated through the Thrixel API is saved to your Thrixel workspace.
Manage and Edit: Visit Thrixel Web App to view, manage, and edit your assets. If you make changes in the web app, ask your coding agent to pull the updated versions back into your game.
Engine Agnostic: Because your assets are managed in Thrixel rather than tied to one codebase, you can also reuse them across projects and engines. For example, you can prototype in Three.js and later ask your agent to rebuild the game in Unity using the same asset library.
Parallel Processing: Thrixel can manage and process jobs in parallel. Your coding agent can farm out parallel jobs to Thrixel while building out the logic of the game. Each plan has a different concurrency limit.
You can test this workflow using the free Thrixel Cubes included with your Starter account. However, building a full-scale game generally requires a wider variety of assets and rapid iteration that usually exceeds Starter limits. Upgrading to a Paid Plan unlocks higher parallel job processing capacity and higher generation limits, allowing you to bring your most ambitious ideas to life. You can keep track of your remaining Cubes anytime in Account Settings.
Learn more about Thrixel at thrixel.com.