Aliens vs Predator 2 singleplayer custom map titled "Morpheus Base".
Map author: Necron
This is an unfinished map with doom-styled narrow corridors that are filled with aliens. It's fun for a quick playthrough, but it is obvious that it needed a bit more polish and more rooms to be 100% completed. When the player reaches the "end" of the map, the player is stuck and is forced to quit to exit the game.