Your rules.
The same room.

Start with something playable

In the essays-site repository, run:

pnpm games:new arena-duel "Arena Duel"

This creates a registered game with working hosting, a board renderer and turn-based rules. Change its module and client to make it your own.

Keep three pieces separate

• Rules: create state, handle commands, simulate and produce player views.
• Client: draw the game, read controls and call the shared room API.
• Catalog: name, player limit, version and module location.

Use Banjoball for a real-time example and Four in a Row for a turn-based example. The room service does not need a new endpoint for each game.

Full contracts and deployment instructions live in game-hub/GAME-API.md and game-hub/DEPLOYMENT.md in the repository.