This was originally going to start out as a full campaign for Left 4 Dead, but since the author doesn't have the time, he decided to make it into a survival map. Hisoriginal idea was to add multiple
Dawntown is a Survival map with a different concept. In usual Survival maps you have only a house or a tower where you can hide or camp and kill the zombies. Dawntown is different. You can run around
Norritt's Mall Survival is a large open survival map that has lots of places to hold out. There are plenty of supplies stashed all over the map in very strategic locations. Designed for high replay value.