Shooting Combat Zombie Survival

How can so many zombies fit in such a small enclosed space? This looks like a military base or some regime facility. In general, you will have to kill 30 zombies in each wave, and the number of waves is 25! That is to say, 750 zombies encapsulated in a very small area! Were they all workers at this facility before they became zombies? Or do they somehow manage to get through the perimeter? How did you get in here alone? Your task is to clear the area from the walking dead? What happens if you run out of ammo? Should zombies kill you with one touch? These and many more questions must be answered during this free online game. Maybe, you will never know the answers to some of them, but tons of fun are guaranteed!