For the next three days, Abstraction Games' Surviving Mars will be available for free on the Humble Store, coming to PC gamers on Windows, macOS and Linux in the form of a Steam code.

Members of the Humble Store will be able to get their free Steam code for Surviving Mars by signing up to the Humble Store's Newsletter. Should users wish, they can then unsubscribe from the newsletter's mailing list after they redeem their free game code.

Humble is giving away free copies of Surviving Mars' Digital Deluxe Edition, which features the game's “Metropolis Building Set", an additional in-game radio station, and three alternative housing styles/skins.

Surviving Mars is a city building game that is based on the surface of Mars, where players have to prepare a colony for human settlers and then keep a full-on space colony operational on the red planet. Players will need to balance resources and navigate through challenging story events to keep their settlers alive and continue growing the colony.

PC gamers can redeem their free Steam copy of Surviving Mars here .