Use W,S,A,D or Arrow Keys to move.
Aim and shoot with the mouse.
Q,E to scroll the weapons.
Press Spacebar when the rage-bar is full.
Tribulation : Stuck in a parking lot full of zombies, Pandoras box will be your only hope of survival. Feed it the souls of your zombie prey to unlock weapons needed to stay alive. A full compliment of unlockable skills makes strategy a big part of staying alive.