The new mutation of this week's Left 4 Dead 2, already active for a few days, thus forcing Survivor Lone Gunman to use only a Magnum to face the horde of zombies, which will be an opportunity for decreased since the 'only weapon available is a single gun. The mutation will be next Friday instead Bleed Out Versus, available only in adversary mode, which will see the Survivor already at minimum power and available only with weapons and pills to cure. Please note that the weekly mode can be played only by owners of the DLC "The Passing".