Crossplay

Is Firmament crossplay?

Crossplay does not apply to Firmament: it has no online multiplayer.

"From Cyan, the indie studio that brought you Myst and Obduction, comes a new steampunk adventure. The game of Firmament is a resplendent, magical, journey — a monumental voyage through four diverse and curious realms, working in concert with an ever-present, clockwork companion, and the support and instruction of a long-dead, ethereal mentor. Everything is not as it seems."