Thru 2/5/13, d/l free pay2win MMOG Stronghold Kingdows from Amazon and you'll be sent a link to get $6 Stronghold HD doiwnload for free. THe infobox implies you have to buy some coin in the game to get the free d/l, but that's not true. My7 info is you don't even have to install SK, just "purchase" it($0.00).
This was an awesome game ... but just a prelude to the amazing Stronghold Crusader, one of the best strategy games ever made in my opinion. Stronghold should get a modern day sequel, I have no doubt it would be a hit.