Just found a new single player game with story. Look: Seven years after the first day of contact, Earth has now become occupied by the Necrotrophs; a name coined by the Resistance scientists to refer to those who harbor the organism that has full control over all sensations and consciousness. The Necrotrophs are not zombies or the undead but are humans that were mentally reverted into an animal-like state; meaning, they don't just simply try to claw at you but they hunt you. They have similar instincts to that of a pack of wolves or other predators. This idea is reiterated in the level design by giving it that "Urban Jungle" look to it. There are trees, tall grass, and obstacles everywhere. This allows the Necrotrophs to weave in and out between all of these elements and gives them an edge when they hunt down the Human Resistance. An interesting element is also the tall grass. It not only works as a great way to reveal every players position (through movement sound fx), but it can give both teams enough dense foliage that allows them to hide -- or at the very least masks portions of their body as they maneuver around the map increasing the difficulty of connecting a shot.