Four fighters must battle hordes of undead in various scenarios, two of which take place in entirely different time periods. (primagames.com)
At first after I played undead nightmare I still didn't know if this was going to be something that I would enjoy playing and thankfully I was wrong again. (gamespot.com)
We suspect that it has to do with the fact that there is a lot of undead in it and a lot of visual modifications are most likely needed. (thatvideogameblog.com)