In the fourth part of Zombie Army, you are welcome to enter a cooperative regime. You will shoot your gun to defeat zombie-Nazi that come back from the depths of the ground after the World War is over. It seems like they cannot accept the defeat and want to take a revenge! The Third Reich is known for being involved in occultism, so here is the surprise they have for us. Save the planet from the horrible invasion of zombies! Use your weapons and kill them once and for all.