Wanna crush zombies like a bug? Insectonator - Zombie Mode lets you do just that plus, a lot of weapon choices to do just that.
Instructions, hints and cheats for Insectonator Zombie Mode :
Use the mouse to pick a weapon then pick one from the four game modes. Shoot zombies with the mouse and change weapons by pressing the Z or X key. Accomplish the set of goals shown on the upper panel to unlock new and powerful weapons.