This expansion is free to everyone that owns the game be it through Steam, GOG.com, Humble, or elsewhere.
'Serenity' for the constructors who enjoy growing the city at their own pace without hard challenges, and 'Endurance' for survivalists looking to earn their stripes and see how long they’re able to live in the harsh cold world of Frostpunk. In both modes, new buildings are introduced to enrich the city’s architecture (including an Archives building that enables players to store lore and information in a single area), new sites can be discovered in the frostland, and new random events that may confront you with previously unknown challenges. Welcome to Endless Mode!