The only thing that really frustrates me about this game is when the zombies stack up. Mainly because the hit boxes at that point are so stacked that if I aim for the head of one zombie, I randomly hit the legs of another. Makes it frustrating when I need to take them down and aim for the head only to lose because I kept hitting their legs.
LOL!
Mission 9, something bugged.. One of my units was under the map and wasn't shooting or getting shot at, and he ran to the other side and I won from Conquering HAHAHAHA!
 "The Last Stand"){kind=icon}
 "The Tickler"){kind=icon}
 "Warfare: 1917"){kind=icon}