To play, first install Zombie Panic! Source on Steam for free. Unzip this file to the maps folder –> C:\Program Files (x86)\Steam\SteamApps\common\Source SDK Base 2007\zps\maps. If you cannot set up a server to play this map properly in multiplayer mode with some friends, you will have to do the following to enable single player test mode:
Enable your developers console in the advanced options menu, then click “create server” and select the map. Once you are in-game press “~/`” [tilde] to open your dev console and type “sv_cheats 1” [enter] then “sv_testmode 1” [enter] and then press F1 to start playing as human, or F2 to start playing as zombie, or F3 to view as spectator.
I hope this tutorial was helpful. Have a nice day!
Josh King aka Ratboy