LOVE THE GAME! I learned the critical hit point on the military zombie and the grub. if you shot the grub as soon as it pulls itself and clings on then shot it with a shot gun in the gun it instantly explodes! and if you shoot a military zombie in the ballz at the right moment they also explode (I know because I tested it on 3 military zombies, really, the need armor there!) I like finding the weak spots on the zombies. (these are likely to be a one hit. I know because they where one hits for me.)