Across the vast Western frontier, a plague is spreading...When former outlaw John Marston wakes up at his farmhouse, he finds a world gone insane: overnight, deranged hordes have overrun the towns and outposts of the American frontier. In a desperate attempt to save his family, Marston must traverse a world torn apart by chaos and disorder, using every skill he has to survive long enough to find a cure.Undead Nightmare combines a terrifying single player campaign as well as the full suite of amazing multiplayer content for one of the biggest games of the year: Red Dead Redemption. Undead Nightmare is a standalone game that does not require a copy of Red Dead Redemption to be played.   Single-Player: Take on a brand new, undead-riddled, single-player adventure Experience completely new gameplay mechanics, weapons, and world design Battle against four different Zombie classes with detailed character design Encounter Graveyard action areas as well as Undead and Mythical animals Find New Collectible Outfits and Challenges to complete 7+ hours of single-player gameplay Multiplayer: Join Friends across the Dying and Undead West in exciting Co-Op missions and Competitive Modes Attack and defend in Stronghold Mode, or claim territory in Land Grab School your friends in Poker, Liar's Dice and Horse Racing Annihilate your enemies with the deadly Tomahawk and Explosive Rifle Play online as iconic characters from Red Dead Revolver or as the legends from Red Dead Redemption. 15+ hours of multiplayer gameplay