Counter-Strike: Global Offensive + Left 4 Dead 2

Counter-Strike: Global Offensive is one of the most popular multiplayer shooters with great impact on the way we look at online gaming. In CS:GO you choose your team- terrorists or counter-terrorists, eliminate your enemies and earn money to buy better equipment at the beginning of every round. The Developers of CS: GO have added new maps, characters and weapons to deliver a better, improved gaming experience. What has also been introduced are the new gameplay modes, matchmaking and leader boards. Still, the most fervent fans of the franchise will not be disappointed as the game has changed only slightly and the classic CS content remains.

Set in the zombie apocalypse, Left 4 Dead 2 (L4D2) is the highly anticipated sequel to the award-winning Left 4 Dead, the #1 co-op game of 2008. 
This co-operative action horror FPS takes you and your friends through the cities, swamps and cemeteries of the Deep South, from Savannah to New Orleans across five expansive campaigns. You'll play as one of four new survivors armed with a wide and devastating array of classic and upgraded weapons. In addition to firearms, you'll also get a chance to take out some aggression on infected with a variety of carnage-creating melee weapons, from chainsaws to axes and even the deadly frying pan. 
You'll be putting these weapons to the test against (or playing as in Versus) three horrific and formidable new Special Infected. You'll also encounter five new uncommon common infected, including the terrifying Mudmen.