Zombie Gunfire

OUR BUILDING IS UNDER ZOMBIE ATTACK! Our headquarter in North American is under attack of chemical weapons,enemies also sent zombie troop there in order to take over the building.Those zombie soldiers pretend to be people working in that building and some of them carry guns with them.This is gonna be a battle we never met and it's no doubt the toughest one.Those zombies are not just saying,if you don't teach them a lesson,they would attack you and leave your corpse there and turn you into them!Let the gunfire and our snipers bullet talk,let this be a one way journey for those zombies. As one soldier of the troop,you have several missions to complete and you have weapons to choose from.Do this carefully and fight like a real soldier!