Eugene, Marcus, and other Survivors return in the spiritual successor of the popular Half-Life 2 Modification Zombie Panic: Source! Contagion is a cooperative survival horror FPS built on the latest Source Engine where players are forced to watch their ammo and aim carefully otherwise be overrun by the zombie hordes. Players will face traditional zombies as well as former teammates who have been turned themselves and where friend becomes foe fueling the carnage to come. Features Play alone offline or online with a friend(s) and other players. You begin your story as a survivor but how long until your taste buds hunger for flesh? Randomly generated weapon, ammo, and item placement. Unpredictable and intelligent zombie spawning system that adjusts to the players actions. A pathing and objective system that has you returning to the same map repeatedly with a fresh feel to it. Full Steamworks support.