Yeah, I love zombies...zombie flicks, zombie stories...zombie anything these days...luckily there are so many outlets to choose from. I could post probably for a month straight, once a day, about a video game based on or containing zombies alone. But I (probably) won't any time soon. However, the twist on RDR by the introduction of zeds is worth mentioning here since I am actually playing it.
A $10.00 downloadable expansion pack on the Xbox 360 called Undead Nightmare continues the story of the orginal game (which I have not finished yet, fyi) with Marston confronting a zombie plague across the old west that is truely a great fight to undertake. Not only is every single NPC in the game (other than scripted characters) replaced with a zombie, it also introduces BIGFOOT too! In additon other animals in the story can also be infected and zombified!! Its a bit challenging, especially since I have yet to master combat in the original game, but it is a blast none the less!!
So for a nominal fee you get a 2nd game on top of a great game to begin with...and zombies!!