Ever since I downloaded the original Doom off Steam I've played the game a lot. In fact, I'm starting to notice a lot of strange things. For example, I have no idea what exactly the Pinky demons actually do to inflict damage. As far as I can tell, them snarling at you up close makes your health decrease. Also, it would seem that UAC designed their facilities to be as difficult to navigate as possible, with tons of hidey holes that don't really serve a purpose.