Per Aspera Free Download: (v1.8.1)

While the base game requires a purchase, several significant expansions and updates are available at no extra cost to owners of the game:

: A free expansion that introduces new terraforming mechanics like vegetation and biodiversity. Per Aspera Free Download (v1.8.1)

: A free content update focused on the late-game urbanization of Mars. Per Aspera on GOG.com While the base game requires a purchase, several