The main goal of the map is to survive the zombie onslaught. Go lone-wanderer and move around the ground , or survive in one of the many holdouts in the map!

Put the map in:

D:\Steam\SteamApps\common\Team Fortress 2\tf\maps
or
D:\Steam\SteamApps\common\Team Fortress 2\tf\download\maps

If you intend on decompiling, you may, but please do not steal. If you intend on making a new version, please give due credit. 

Enjoy!