Put in C:Program FilesValveSteamSteamAppsSourceMods

so it looks like C:Program FilesValveSteamSteamAppsSourceModssmod

The shovel + zombies = XD

type in console sv_cheats 1 and impulse 101

Make sure to bind bullettime and quick kick in the options menu

Oh and make sure to type this to get infinite run and bullettime sv_infinite_aux_power 1

and exec performance_highspec

to get the matrix bullet trails

Note: Without the sv_cheats you cannot do bulletime, without IMpulse101 you won't get even 1/10th of the new weapons