Quote 1)Right Mouse Buttom (RMB) on Iron Sky Invasion in Your game library.

2)At the bottom - Properties.

3)At the top of the new window - BETAS

4)Enter this code - "isilinuxbetatest" and click "Check Code"

5)Select the beta "Linux Beta Test".

6)Close window and it should update Your game.

Article taken from GamingOnLinux.com.

Topware Interactive are again continuing their Wine porting of older titles, this time it's Iron Sky Invasion [ Steam Official Site ].Again, it's really nice to see Topware bring older titles to Linux using Wine. As long as it works and it works well I couldn't care less. It means it counts as a Linux sale (the most important thing) and it's less hassle to not have to setup anything yourself.Anyway, if you're interested here's their instructions from the announcement (Official)Set during the main conflict of the movie, “Iron Sky: Invasion” puts players in the cockpit of an advanced new starfighter, to test his or her might, flight and dog-fighting skills against the forthcoming Blitzkrieg-on-high. The main objectives are to defend Earth and its space installations from enemy attacks, blast as many Nazi ships into oblivion as humanly possible, collect and skillfully manage necessary resources, and make it alive to the final confrontation… where the ultimate secret weapon of the Fourth Reich awaits those foolishly brave enough to take up the hammer and chisel of heroism and attempt to carve their names onto the tablets of history.Thanks for messaging me about it BdMdesigN!