Zombies walkthrough:

open desk
take pistol
search boss
put ammo in gun
shoot door
take bat
go south
take chainsaw
go east
go south
open small crate
open bag
take bag
hit large crate
take brains
go west
drop brains
hit zombie with bat
search zombie
unlock door with key
open door
go east
go north
open name plate
take key
unlock door with key
open door
go east
drop powder
go west
drop powder
go south
drop powder
go west
drop powder
start chainsaw
go south