Open Terrain EngineOpen Terrain Engine

In development — design complete, building now

The game engine your AI agent can actually build in.

An AI-native game engine. An LLM agent authors the whole game in idiomatic, human-editable C# — and you can open and edit every line.

  • Linux + Windows
  • Vulkan
  • .NET 10 / C# 14
  • Steam
  • FPS · third-person · side-scroller · top-down · RTS

The agent writes the game in C#

An LLM agent authors a complete game in ordinary, idiomatic, human-editable C# — no DSL, no separate scene format, no editor-owned files it can't see.

Deterministic, headless verification

Fixed-timestep sim + seeded RNG + offscreen render. The agent reads back exact world state and a screenshot, and asserts the game is actually right.

Model-agnostic MCP

A built-in MCP server exposes the whole surface to any LLM — Claude, ChatGPT, Gemini, or local models — through any conformant client.

You own every line

Open and refactor any generated code in standard .NET tooling. The AI is the default author — not a wall between you and your game.

Be there at launch

The waitlist sign-up is coming online shortly. Until then, follow the build in the open on GitHub — and we'll post here the moment it's ready.