Superposition

Version 0.3.0 (Looks and ease) is in progress. Not released yet.

The game engine built for AI agents

Your agent reads the game as text, changes it through one command, runs it and checks the result. You can open the same project in the Studio at any time.

See the featuresWrite to us
Superposition Studioexamples/village
The Superposition Studio: a dark window with the village scene in the viewport, the scene tree and inspector on the left, and the console, tests and profiler tabs below

Read, change, check

The same loop a good developer follows with code. The aim is a better game, built faster, than an agent could make from raw code.

  1. Read

    A game is a folder of plain-text files. Scenes and prefabs list entities and their components with readable ids, like player and crate_2. Saving and loading give byte-identical files, so diffs stay clean.

    scenes/main.scene
    format = 1
name = "Main"
 
[settings]
# A light haze: far things fade into the horizon.
fog = 0.008
vignette = 0.2
 
[[entity]]
id = "camera"
 
[entity.Transform]
position = [0, 4, 10]
rotation = [-18, 0, 0]
 
[entity.Camera]

  2. Change

    Every change is one spx command. Commands are logged with their author and can be undone. Two agents, or an agent and a person, editing one project get a conflict instead of a silent overwrite.

    Terminal
    > spx entity add crate --parent ground --set Transform.position=0,1,0 --tag pushable
> spx set crate Transform.rotation 0,45,0
> spx scene set fog 0.02
> spx entity scatter tree --area -80,-80,80,80 --count 120 --gap 4
> spx undo

  3. Check

    The simulation is deterministic, so a run replays exactly from a seed. Scenario tests play the game and check its state, golden images catch visual changes, and spx perf gives numbers.

    tests/smoke.test.ts
    test("the main scene loads and runs", async () => {
  await frames(30);
  expect(world.all(Camera).length > 0).toBe(true);
  expect(world.frame).toBe(30);
});
 
> spx test
> spx verify --human

When something is wrong, the error says where, and how to fix it.

Terminalstderr
error[E0005]: 'C:\shots\yard.png' is outside the project folder; spx writes files only inside the project.
  fix: Give a path inside the project (such as screenshots/shot.png), and copy the file from there if you need it elsewhere.

Works with the agent you already use

Any agent that can run a command or call a local API can use the engine. spx connect writes the files these agents need, and spx mcp and the local HTTP API expose the same commands.

Set up by spx connect

  • Claude Code
  • OpenAI Codex CLI
  • Gemini CLI
  • Cursor
  • GitHub Copilot in VS Code
  • opencode
  • Aider

Read the project's AGENTS.md

  • Windsurf
  • Cline
  • Roo Code
  • Zed
  • JetBrains Junie
  • Amazon Q
  • Copilot's coding agent

Add spx mcp in their settings for the full command set.

Written from scratch, in Rust

The renderer, the physics, the scripting language and its compiler, the shader language, the image, audio and font readers and the UI are all in the engine's own code. The only outside interfaces are Windows and the GPU.

Version
0.3.0 (Looks and ease), in progress
Engine
21 crates of Rust, no third-party crates
Content
33 example projects and five templates
Platform
Windows 10 and 11, a GPU with Vulkan 1.3

Rendered by the engine

All screenshots
  • A small 3D village: timber and brick houses, a well in the plaza, villagers, a red brick windmill and a forest behind, with a quest line and a counter on screen

    Village. An RPG-lite with dialogue, a quest, an inventory and a reward.

  • A robot in a dirt yard of crates, barrels and stone pillars, with a white windmill behind

    Windmill errand. Imported models, three pickups and a door that opens.

  • The 2D platformer template: an orange hero on green ground with pickups, a floating platform, a pit and a score counter

    2D platformer. A small course from the platformer template.

Two plans, at 1.0.0

Engine, and Engine and Simulator. Prices come with the launch.

See the plans

Questions?

Write to us about the engine, the plans or anything else.

Write to us