Stronghold HD and Stronghold Crusader HD are now available on Steam. These updated versions of Firefly's castle siege games are on sale for 30% off for the coming week and the purchase of either game also includes a Stronghold Kingdoms Starter Pack to allow you to check out the MMO installment in the series, though the games are also being offers free to those who already own the Stronghold Collection. Here is a Stronghold HD Steam launch trailer and a Stronghold Crusader HD Steam launch trailer to off updated HD graphics, and here's word:

Stronghold HD and Stronghold Crusader HD update the classic castle building games with high definition graphics and the ability to play in real time with the entire map on a single screen. Remastered to support resolutions up to 2560x1600, these HD updates take advantage of modern PC hardware allowing players to see all the action on screen at once. Advance on the castle gates while flanking the enemy from behind, feign retreat and lead your foes into a deadly trap or just sit back and watch the destruction unfold!

Stronghold and Stronghold Crusader were originally released in 2001 and 2002 to critical acclaim and commercial success. Over the years the Stronghold series has grown to become one of the most enduring RTS franchises in gaming, with sales of more than 6 million. Firefly’s most recent success has been in the MMO genre with Stronghold Kingdoms, which currently has over 2 million players in over 100 countries. A sequel to the original Stronghold Crusader is set for release in early 2014, which will be self-published by Firefly Studios on Steam.