Valve has a special Christmas gift for Steam users: a free copy of its zombie survival shooter, Left 4 Dead 2.
The game, which is available for Windows, Mac OS X and Linux, puts you in the shoes of a survivor in a zombie apocalypse. Your task is simple -- survive until help arrives -- but to do that, you'll need the help of other survivors, making co-operative gameplay a must.
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The game will be free for download until Dec. 26, 1PM EST. You can download it from Steam by going to the Left 4 Dead 2 page and clicking 'Install game.' Steam's servers are currently overwhelmed with the demand, though, so don't be surprised if you have to wait a bit until you actually get the game.
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