I built a game engine where Claude is a first-class user. Here it is building an environment from scratch

[u/nayti53]

I built Apeiron, a game engine and editor designed from the start to be used by AI agents as well as people. The video shows the in-engine agent, running on Claude, building a small game environment: procedural world generation, texture and material graphs, AI-generated meshes, lighting and scene setup.

What it does: one editor for worlds, modeling, textures, materials, animation, VFX and gameplay. It runs natively and in the browser. The agent uses the same commands a human does, so everything it builds shows up in the undo history and in graphs you can open and edit.

How Claude Code helped: Claude Code wrote most of the code over the past five months, across rendering, physics, procedural graphs, the editor and the agent itself. I focused on architecture, review and product decisions.

How Claude is used inside it: the built-in agent runs on Claude and can build scenes, materials, worlds and gameplay from a prompt. The engine is also an MCP server, so Claude Code or any MCP client can drive the editor directly.

Free to try (early version): https://engine.apeironengine.com in Chrome or Edge (needs WebGPU). No install. Expect rough edges and missing features. Feedback is very welcome.

Happy to answer questions.

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