This Doom 'speedrun' took more than three weeks

pcgamer.com:

Doom is the quintessential speedrunning game and, ultimately, that comes down to some of id's early design principles: Doom's WAD format ('Where's all the data?') made it easy for players to mess around with the game, and you could argue that the contemporary modding era began here.

The players who coalesced around and obsessed about one man's quest to slaughter lots of demons have done almost anything you can think of with the game, and one infamous oddity is called Nuts.

Nuts is a map created in 2001 by the prolific  Doom modder B.P.R.D. While much of this modder's output is genuinely great stuff like Equinox, Nuts would become a trilogy of 'joke' maps. This being Doom, the joke is thus: Nuts contains 10617 monsters across two rooms, and is pretty much unplayable as a result.

One of the biggest elements of the joke, and a very important one for context here, is that even if you wanted to kill all of these monsters, you couldn't. The level gives the player a plasma gun and BFG, along with a bunch of ammo, but there's nowhere near enough to kill everything, particularly as the second room is stacked with high-health cyberdemons.

The map is notorious enough that speedrunners worked out ways to speedrun it anyway. The two main styles are a race-to-the-finish where you don't kill anything, and simply have to avoid being boxed-in by the enemies, and one where you kill as many enemies as possible before ending. The record in the latter category was held by Hurricaine Jr. with 92% of enemies killed.

Enter Doom speedrunner ZeroMaster. ZeroMaster had a theory, and in their own words here is what came of it: «Pain. I started working on this 4 months ago…»

I'm going to explain the run, but ZeroMaster did this around a year ago,