More than just zombies

You may think that this is about just zombie game. However, this is NOT true. This is more than that. We would like to say that most of things that you should eliminate in this game are more of "unindentified creatures" as a result of secret experiments. Some of them will move like a typical zombie but some will crawl or jump in a way you've never seen before. Also, even though lots of them look like a zombie but some are totally different from typical zombie. Let's play with a variety of monsters created by side effects of secret experiment of Black Rain.