Nickerous writes, "As a big fan of AMC’s The Walking Dead, [We] figured [we] would enjoy the zombified universe of RDR. Turns out, [we were] right. The game play hasn’t changed from the core of RDR, but what did change made Undead Nightmare really stand out. There are zombies everywhere and you’ve got to find a cure for your wife and son, if there is one to be found. That’s the main storyline of Undead Nightmare.