You are a survivor. You have just arrived on the battlefield and found an abandoned building. You have no idea what kind of danger you are in, but you know that it is not a good idea to stay in that place, so you take a look around and see if there is anything that could help you.

You find a first aid kit, a grenade, a sniper rifle and even some ammo. You also find some weapons that you can use, but you have no idea what kind of weapon they are. So, you look for an enemy, and when you find one, you start a fight.