Left 4 Dead

This is one of the many zombie apocalypse games out there. There are many different places you can play at, hospitals, schools, etc. It is a big multiplayer game with a few different characters to play from. You spawn in a building watching a helicopter fly away and zombies begin to advance towards you, as in you are "left for dead". You receive a radio signal from the copter saying they will double back and are given a location to meet up, but the challenge is getting there alive. You have to fend off the many zombies that are coming after you as you and your team advances towards the rescue point.