We apologize for the lengthy amount of time it’s taken for us to post our review of Red Dead Redemption: Undead Nightmare, Rockstar Games’ latest downloadable add-on for its hit Western game. Truth is, there’s only one thing to blame for the delay – zombies. We’ve been having such a damn good time running through town and riling up piles of the undead that it’s been way too hard to stop. Unlike previously released downloadable content, Undead Nightmare contains both abundant single player and multiplayer missions. In the six-plus hour story mode, you’ll guide John Marsden through a journey of zombie killing and mission completing, while hunting a few zombified animals on the side.