You are a soldier in the marines who wakes up in a mysterious dungeon. You don't know where you are (or why) but you do know you need to get out of there. You have to fight your way out of this place, and do no matter what it takes to see your wife and children again. Zombies and skeletons smother your path of darkness but with the aid of a ghost willing to help you, you might just make it out.
The whole map is a big dungeon, with smaller dungeons throughout. some are mazes, some test your athletic ability - this map has everything! Some of the dungeons are gigantic, and there are quite a few. One of them is a wooden structure, high in the air, which is falling apart as you traverse it. Another is a large maze. The sizes vary.