I made a thread about this a while ago and some people helped me with it but I got bored and decided to do it myself.   So after multiple days of wiki crawling, here is a list of a bunch of WADs and maps by monster count, from lowest to highest.   All are based on the monster count for Ultra-Violence difficulty or equivalent and single player, unless stated otherwise. I'm counting Romero heads, Commander Keens, monster spawners, and spawn points, as they are listed as monster