Are you a Left 4 Dead 2 addict? Do you scoff at those who don't play in Realism mode, because seeing where your teammates are is for newbs? Do you handicap yourself by using just the pistol and shove attacks? Perhaps you even dream of zombie killing at night. Well, for you hardcore undead re-murderers, Valve has just the thing for you, so you won't be far from your favorite special Infected even when you are tucked snug in your bed.