Short answers before you start
You can play in free text: describe an intent instead of selecting only a predefined button. The server saves the campaign, validates rules, and applies changes atomically; AI controls narrative form but cannot write arbitrary state.
Available worlds, genres, and platforms are described on dedicated pages. Check the application and live catalog for current plans and free-start availability because static copy should not promise a stale price.
Boundary and failure behavior
Do not put passwords or secret keys into game text. If a provider fails, confirmed history should remain intact and an unfinished turn should not create partial consequences.