Play Natural Selection 2 for FREE now through Sunday at 1PM Pacific Time! Additionally, You can also pickup the full game at 75% off as part of this week's Weekend Deal*!Natural Selection 2 is an immersive, multiplayer shooter that pits aliens against humans in a strategic and action-packed struggle for survival. It seamlessly combines a shooter/FPS gameplay with a strategy (RTS) game.If you already have Steam installed, click here to install or play Natural Selection 2. If you don't have Steam, you can download it here *Offer ends Monday at 10AM Pacific Time