XCOM: Enemy Unknown is a pretty impressive real-time strategy game that we're big fans of, and despite only being available on Steam for a few weeks it's now half price until July 22. Considering this is a $39.99 value game that can now be yours for just $19.99, it's well worth pulling the trigger.

The added beauty of downloading through Steam is the enabled Steam Play, meaning you can also download the Windows PC version of the game too, if you're into that sort of thing. Any takers?