With the new patch, Valve has added a brand new game mode to Left 4 Dead. Let's take a look at the other ways to play first, however. First in the modes is Campaign, which tasks four friends to push their way through hordes of crazy infected on a path to true escape. Second is Versus, which pits four survivors against four special infected in a competitive form of Campaign. Finally comes the new mode, Survival, which is like Campaign mode... sort of. Think the finale of each campaign mode. Now imagine that finale if it were 10 times bigger and badder, and you had no way to escape. Only death lies ahead. Think you have what it takes? If not, no worries, as here's a handy-dandy guide for you!