Rockstar

Red Dead Redemption: Undead Nightmare Rockstar

Undead Nightmare is a standalone disc. It will NOT require a copy of Red Dead Redemption for it to be played.

Red Dead Redemption: Undead Nightmare introduces hours of a new single-player storyline and brand new multiplayer content. Seemingly overnight, a zombie plague ravages the once bountiful frontier, decimating the landscape and reawakening the dead. In towns, settlements and outposts throughout the world, the uninfected citizens are left to fight for survival against waves of the undead. John Marston must ride out into the vast and terrifying world and survive long enough to find a cure. Four zombie classes enter the fray, each possessing unique characteristics, attacks, and defenses. Mythical creatures roam the frontier, alongside zombie cougars, bears, wolves and many more. Taking down the undead requires non-traditional weaponry, including the new Blunderbuss, which can be loaded with looted remains of fallen zombies. The deadly Tomahawk and the Explosive Rifle make a triumphant comeback and will be available exclusively for those who downloaded the Legends and Killers Pack and the Liars and Cheats Pack.

The all new single-player narrative features new challenges, quests, and ambient events, including Missing Persons, where the player must find a missing survivor lost amongst the throngs of undead. New competitive multiplayer and multiplayer free roam content includes Undead Overrun, a brand new multiplayer survival mode where waves of infected attack and players must work together to stay alive against increasingly difficult odds.

Red Dead Redemption: Undead Nightmare, a single, stand-alone disc that bundles together for the first time ever, the Undead Nightmare Pack, the Outlaws to the End Co-Op Mission Pack, the Legends and Killers Pack, the Liars and Cheats Pack and all the Multiplayer Free Roam modes released to date.

Undead Nightmare is a standalone physical disc based SKU.
It will NOT require a copy of Red Dead Redemption for it to be played.
It contains the full single player Undead Nightmare game.
It also includes the full RDR multiplayer experience: including all multiplayer modes from the original game and all the multiplayer content released in the various packs post release.
You won't require an internet connection to play the Undead Nightmare single player game.
You will require an internet connection to play any of the multiplayer.