Valve’s cooperative first-person shooter Left 4 Dead 2 is free on Steam for a limited time. “It will be free as in, grab it now, pay no money, and it is yours to keep forever – FOR FREE!” Valve said on the Left 4 Dead official blog.
Due to the number of requests, Steam collapsed for a few hours this Christmas. As of this news article, I didn’t have any issues navigating the store, but if you want a free copy of Left 4 Dead 2, make sure you download the game as soon as you can.
Left 4 Dead 2 will be free until 10am PT on December 26th. Please take into account that to claim a free copy of the game, you need to install it and not just purchase it.
Source: Left 4 Dead Blog