Steam is full of XCOM goodness this weekend, with XCOM: Enemy Within 10% off when you pre-order; XCOM: Enemy Unknown is free to play and the XCOM franchise is on sale.
Enemy Unknown will be free to play through October 6 and the XCOM franchise sale is on until October 7. In order to keep your progress from the game, you will need to purchase it before the sale ends.
Meanwhile, XCOM: Enemy Within is 10% off when you pre-order for PC or Mac and in case you have been living under a rock, the game is the expansion pack Enemy Unknown. It releases on November 12.
The following titles are also on sale for 75% off, except for The Bureau: XCOM Declassified which is 33% off:
X-COM: UFO Defense
X-COM: Terror From the Deep
X-COM: Complete Pack
XCOM: Enemy Unknown
XCOM: Enemy Unknown – Slingshot add-on content
XCOM: Enemy Unknown – Elite Soldier Pack add-on content
The Bureau: XCOM Declassified (33% off)