If the last survivor on Earth is bitten by a zombie and no one is alive to hear it, does he make a sound? Left 4 Dead 2’s latest mutation attempts to answer this question with its first-ever update for single player, Last Man on Earth.

The new mutation spawns a world with no common infected, just pockets of special infected to hunt down your tasty, tasty fleshmeat. This one is a personal test, with no help from survivor bots or split-screens, and only available in single player.

With all Left 4 Dead 2 mutations, Last Man on Earth is available to those who have downloaded “The Passing.” Next week’s mutation will be one Valve has fanboyed over since the first mutation, Chainsaw Massacre, which gives all players chainsaws and an infinite supply of gasoline.

By the way – yes. The last man on earth screams like a little girl when the zombies finally hunt him down and devour his succulent body. Just FYI.