anyone remembers old D&D module, one of most deadly adventure, with crazy mosiac of wall mural. creatures pop out of the wall attacking you, traps, tricky puzzle must be done in correct order, and teleporting to random rooms. something similar to "Shadowgate" theme.
That was a good one, I like "The Iron Tower" myself a lvl 16th dungeon roughly that ended up with a CR 21 boss at the end man I read that module never ran it but oof that would be painful. I recently fought a CR 10 Clay golem as my lvl 6 Barbiarn/Savage Warrior in Pathfinder... getting critted for 62hp when you only had 63/99 really hurts my poor girl almost died if it weren't for my DM pretty much looking at me and say "You probably should withdraw action here" I think he was being nice and telling me even though I can do 30-50 avg damage on this character that golem was not going to die.
