Any custom WADs having clusterfucked maps?

When it comes to playing levels in Doom, I mainly prefer the ones which are long and totally fucked up, with a lot of twists and turns, like MAP14, MAP17 and MAP24 from Doom 2. After doing a full playthrough of Doom 2, I decided to check up on YOUR levels, and I need some suggestions, for some of the most longest maps, and to present myself a challenge, try to add nearly impossible ones as well..!

I have a level that may fit your criteria. It takes several hours to beat. Others wouldn't enjoy it but it's whatever.

https://www.doomworld.com/idgames/levels/doom2/Ports/a-c/ccm

Any slaughtermap set? Like slaughterfest series? ItaloDoon?

Some of Jon Landis's more experimental maps should provide a lot of tormentation.

Eye of the Beholder II

Eye of the Beholder

Many of Sonny Wasinger's wads will have you tearing your hair out too.

And let's not forget Incredible Shrinking Marine.

Dare I even mention Barrel2?

Have, er, fun.