Orcs Must Die: Unchained is the third game in the Orcs Must Die series and is currently in alpha. There are ways that gamers could get into the alpha including signing up for one of the founders packs available on their website. The founders packs all you to help development of the game by paying early but also getting cool in game rewards in return, including alpha access.
Well if you are strapped for cash and want to get into the alpha, now is your chance as Alienware is giving away alpha codes on their website. Act fast however as there are only around 6,000 codes left as of this writing and they are going fast.
To get an alpha key, check out the official promotion.