Don't read the 1-star review, he spoils the ending
Dianne Cox, Amazon
7 July 2014
Summary: not sure why the other guy 1 star'd it, Undead Nightmare is one of the best stand-alone DLCs there is, Rockstar (take two) has proven themselves several times in terms of game development and this is no exception, definitely get it if you love zombies. The game purposely nails the B-list zombie movie vibe and is a lot of fun.
Summary: Excellent game. Adds a nice TWIST to it's originator game (Red Dead Redemption) same maps, with a VERY different adventure setting. Familiar faces, but some may be UNDEAD this time around. Overall? A HUGE thumbs up 5 star game!