Left 4 Dead 2 :The Passing Releases April 22nd.
HellDescent writes: "What’s this? Mutations? And we can get six, or more of them in ‘The Passing’? What are you talking about Valve?!
Valve has just revealed the achievements on their left 4 Dead blog, and we get a clue as to what the new game mode will be. It seems like Mutations will have something to do with it. Possibly a mode where the survivors have to endure being partially infected…
Update: The Passing Released April 22nd for both PC and Xbox 360"
