Left 4 Dead Survival Pack:
The Left 4 Dead Survival Pack is a collection of new content for 2008's Multiplayer Game of the Year. Headlining the pack is the new 1 to 4 person game mode, Survival, that challenges players and teams to "survive" unremitting swarms of zombies on over 10 maps. Rounds are scored by length of survival, and times will be uploaded to leader boards. Also included in the Survival Pack are two additional Versus campaigns. Each campaign features 5 maps for additional play of the four-on-four multiplayer game that allows players to compete as Boss zombies Versus the human Survivors.