Merge Gun: FPS Shooting Zombies main mission is to shoot down all coming undead creatures before they kill you. Before you join the battle, you can buy more guns and merge the same guns into new advanced ones. With more powerful and fast ammo in the clip, you can deal with incoming enemies more easily. Both zombies and crows will move forward to you even if you are still reloading. Keep calm and shoot the explosive oil cans on the ground if necessary.