XCOM Enemy Unknown free to play until Sunday on Steam, franchise on sale
Commander, FIraxis' XCOM: Enemy Unknown is currently free to play on Steam through Sunday until 16:00 Eastern. The franchise is also on sale until Monday, October 7, until 10:00 Eastern. Players should also be aware that if they start a game through the free offer, they'll need to buy it before the weekend is over for $10 to retain their progress.

The free-to-play weekend is actually part of a publisher sale going on with 2K Games over at the digital distribution network. Amazon is also having a similar deal. We'll be watching your progress with interest, Commander.
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XCOM: Enemy Unknown 'Slingshot' DLC (11/30/12)

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Hello Commander,

2K and Firaxis Games are happy to announce that the digital pre-sale for the PC and Mac versions of XCOM: Enemy Within is now live at participating digital retailers. Fans who pre-order XCOM: Enemy Within digitally for PC and Mac will receive 10% off their purchase. XCOM: Enemy Within is the expansion pack to the award-winning XCOM: Enemy Unknown and will be available in North America on November 12, 2013.

To celebrate the digital pre-sale for XCOM: Enemy Within, the XCOM franchise* is currently on sale at participating digital retailers for up to 75% off! Additionally, gamers new to XCOM can play XCOM: Enemy Unknown for free now via Steam's Free-to-Play Weekend until Sunday, October 6 at 4:00 PM ET. The XCOM franchise sale pricing is available now until Monday, October 7th at 10:00 AM ET. If players would like to keep their XCOM: Enemy Unknown game progress from Steam's Free-to-Play Weekend intact, they will need to purchase XCOM: Enemy Unknown before the sale ends.

*The following titles are included in the XCOM franchise sale at 75% off unless otherwise noted:

X-COM: UFO Defense
X-COM: Terror From the Deep
X-COM: Apocalypse
X-COM: Interceptor
X-COM: Enforcer
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)

Good luck, Commander. We will be watching.

This article was originally published on Joystiq.