@Felthry @LANthus If I remember rightly, it alters Doom's default behaviour, but as a result it works with ANY map that has monsters in it. Basically there's no weapons, none of the monsters are hostile to you. They just mill about doing their thing as if there IS a player around they want to target, but not actually hunting them because there is no player TO target. You can talk to them, they talk about things, or ask for things, you can find items, and give them to them to help them!
@Felthry @LANthus And it's called the "Mr. Friendly" mod for Doom.