To those who have not purchased Left 4 Dead 2 on your Steam account, it is a wise choice as today Steam announced that just for Boxing Day, they’re allowing users to download Left 4 Dead 2 for absolutely free! Yes, it is completely free for life as once you get this installed you can use it forever.
Hurry up and get this installed as this offer would expire by 10AM PST on 26th December 2013. How to get this installed? Go to Steam store and click on install the game, as easy as that nothing more to do in order to claim this free game, however it is recommended that you skip to the campaign mode before moving in to the competitive modes just in case to avoid any problem until this offer is completely closed. 
One more thing, if you’re having problem downloading the game and could not redeem this game when you click on ‘Play Game’, don’t worry, just make a desktop shortcut, followed by pasting ” ://install/550 “, then click ‘Next’ for two times, and you can now play the game flawlessly by clicking on the created shortcut once you have downloaded.
Do take note that Steam Store is having a nice 50% offer for Valve Complete Pack which includes 24 of their high-end games for the price of $49.99 USD instead of $99.99 USD which is worth every penny for all those games included.
Have fun “Zombifying” .