Crossplay

Is Cities: Skylines - Snowfall crossplay?

Crossplay does not apply to Cities: Skylines - Snowfall: it has no online multiplayer.

Cities: Skylines - Snowfall is an expansion for the city simulation game Cities: Skylines. Snowfall will allow mayor-players to expand and grow their cities using new transportation options while challenging them to meet citizens' needs using several new in-game tools. All of these new inclusions will revolve around the expansion's central feature: an in-game weather system.