Unlimited ammo and money.
Blow apart big waves of zombies using an array of guns and hired buddies to fight by your side. Purchase bigger and better guns and hire assistance with big firepower to give those hoards of zombies a good spanking, keeping them away of your territory. 50 rounds in all!
Aim by pointing the mouse cursor, open fire by holding down the left mouse button. Spacebar to drop a bomb. Press 1-9 to switch guns (must be purchased first!)