Steam has a full schedule this weekend, with Sonic & All-Stars Racing Transformed and War of the Vikings playable for free through Sunday at 1PM PT, plus sales on Omerta: City of Gangsters and Killing Floor.

Omerta is 75 percent off, $10, through Monday at 10AM PT. Killing Floor has kicked off its Twisted Christmas Event, offering the game and its bundles for half off through January 2. That's $10 for the game alone, $50 for a six-pack and $25 for a 14-item DLC bundle. Sonic and All-Stars Racing Transformed is also 75 percent off through the weekend, going for $5.

http://www.joystiq.com/2013/12/05/st...s-free-to-pla/