Valve pissed off some gamers after announcing a new downloadable campaign for the original Left 4 Dead with just months until the release of Left 4 Dead 2. It is still not sure if the DLC will be compatibole with the upcoming sequel. In an interview with Edge Online, Valve’s Chet Faliszek explained that even the game’s creators are unsure whether the new campaign will be playable in the second edition of the zombie game.

Faliszek claims that Valve is “struggling” to figure out how to incorporate the new DLC and old scenery with the new game and characters. He says it would be jarring to “put new characters in old places,” but recognizes that “there’s a whole group of the fans who don’t care.” I say just leave the DLC content out and push the sequel!