It's Christmas time in New York City. A strange virus has appeared in the city, turning seemingly normal people into insane, violent folks called: Infected. Rookie Officer Stevens is one of the first victims of the Infected. But unlike others, Stevens is stangely immune and doesn't lose control. The mysterious Dr. Schaeffer discovers that Stevens' immune blood can be used to destroy the otherwise unkillable Infected. Schaeffer creates a special "viral gun" that fills shells with blood from Stevens' arm and blasts them straight into the Infected, causing them to die. Stevens is the only person who can save New York - and Christmas - from the Infected!Infected features an engrossing single-player campaign with lavishly gory details and unlocks the world of WiFi with blood-thirsting multiplayer modes. There is also an innovative multiplayer system called "chain infections" whereby players create unique avatars and pass them on to each other's PSPs like viruses. If infected by another player, the gamer will actually find his avatar running around fighting in his single-player game. Through multiplayer victories, players spread their avatars around the real world, player to player, in massive, viral chain letters of evil!Infected is a game of shifting power, chain reactions, huge explosions and double-fisted gunplay.