Run around the dark city streets and try not to die! Survive for as many days as possible, while converting zombies into humans or vice versa. As a human it is your goal to shoot as many zombies as possible with an experimental reversal drug that will make them human again. If you are unlucky enough to be infected by zombies yourself, you turn into one. Once you are a zombie, you have a new objective - infect as many humans as possible so that they are converted into zombies.