*Based off the Left4Dead video games.*

StoryLine

You're one of 8 survivors. You've got guns, various melee weapons, some healthpacks, a few bozes of ammo. And thousands of zombies waiting outside to eat your brains.
CEDA is supposed to be evacuating the "immune", that means you and your buddies right next to ya. The survivors who haven't been infected and "zombified" by the virus...But most of the evacuation locations have been abandoned and subsequently taken over by the groaning, moaning, quick moving, flesh eating zombies.
Along the way to the last remaining evacuation point in all of New York City, there are these things called "Safe Houses." Your safe from the zombies there, but only for so long. Stock up, reload, and heal. And then run like hell through the crowds of Infected on your way to the next safe house...Or better yet, the evacuation point...If it's even still there.