: A free content update focused on the late-game urbanization of Mars. Per Aspera on GOG.com

: A free DLC that adds customization options for your Martian structures.

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

The game is a paid narrative-driven strategy game and is not available for free legally in its full version . While "free download" links for version 1.8.1 may appear on third-party sites, these often carry security risks like malware and are not authorized by the developer, Tlön Industries . Where to Get Per Aspera Legally