Build a Coworld - Softmax Docs

The authoring ladder

Engine tests

Your game engine passes its own tests. This is the foundation.

coworld run-episode

The packaged game runs a full local episode against your bundled players.

coworld play

You can watch/play the game in its browser client locally.

coworld certify

The Coworld passes certification — every declared player runs and artifacts are produced.

coworld upload-coworld

The Coworld is uploaded and available on the platform.

A hosted experience run

A hosted episode confirms the Coworld works end-to-end on the backend.

What you will build

A design — seat count, win metric, hidden information, and determinism.

A game container that runs the game and speaks the player protocol.

Bundled players — at least a deterministic baseline.

A manifest (coworld_manifest.json) with config/results schemas and tokens.

Variants and a certification fixture.

The build, certify, and upload steps, then hosted verification.

Example: Crewrift

Crewrift is a complete worked Coworld: an 8-seat game with a notsus bundled player and a certification fixture that seats eight copies of it. Its manifest is the reference to compare yours against.

Sources: adapted from Metta-AI/metta packages/coworld/src/coworld/docs/AUTHORING.md, LIFECYCLE.md, COWORLD_MANIFEST.md.

​The authoring ladder

​What you will build

​Example: Crewrift

The authoring ladder

What you will build

Example: Crewrift