Undead Nightmare adds on zombies with new expansion pack Just in time for Halloween,

"Red Dead Redemption's Undead Nightmare" extension pack is available for download. The pack provides new missions while turning the entire world into a zombie world. If you don't presently have or want a copy of "Red Dead Redemption" you can buy "Undead Nightmare" as an extention pack in late November. Source of article - Undead Nightmare adds infectious zombies to Red Dead Redemption by Personal Money Store

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Adding on to 'Undead Nightmare'

Do you need the “Undead Nightmare” extension pack? Well it can only be downloaded today digitally if you already have a compy of “Red Dead Redemption” on hand. The extension pack turns the world of "Redemption" into a zombie-infested world. Multi-player missions are new along with a new single-story mode. New weapons, creatures and distinct zombie classes are added also. The game is already popular without the added “Undead Nightmare.” This just ads more horror-play to the game.

'Undead Nightmare' fights

Fighting the infection plague is the goal within the “Red Dead Redemption Undead Nightmare” extension pack. ”Red Dead Redemption” is meant the make the player a previous outlaw bringing order to the west, as it is based upon off the 20th century American frontier. It is quite hard to take care of a town with the “Undead Nightmare” zombies. They make the task harder.

The 'Undead Nightmare' disk could be coming out here soon

The “Undead Nightmare” expansion pack could be downloaded by anybody who already has “Red Dead Redemption”. The 800 Microsoft credits or $29.99 playstation download doesn’t require any kind of no no fax cash advance. On Nov. 23, a standalone disk pack can be released. There could be more than just “Undead Nightmare” in the disk pack. “Liars and Cheats” and “Outlaws to the End” could be incorporated too. By releasing extension packs rather than a new version of "Red Dead Redemption," the game studio is extending the playability and lifespan of the game in the highly competitive market.