12-year-old Doom 2 challenge map finally beaten after six-hour, 23K-demon grind
12-year-old Doom 2 challenge map finally beaten after six-hour, 23K-demon grind

arstechnica.com
12-year-old Doom 2 challenge map finally beaten after six-hour, 23K-demon grind

I remember a similar story some time ago, of another map that was just a big arena filled to the brim with all the enemies. Part of the strategy was circle strafing the whole place while enemies killed one another, then using the ammo to deal with whatever was left. Can't remember the map name
it's called Nuts, Karl Jobst did a video on it!
https://youtu.be/iKOMN98DzQA