Lots of the vanilla WoW instances was like that. Often the way to the entrance was populated by the same level elites as the dungeon so you had to run a gauntlet just to get in.
The Deadmines and Uldaman comes to mind. And since you spawned at the entrance you had to dodge and sneak past patrols avoided on the run. Gnomereagan and Maraudon and parts of Dire Maul was very maze like if my memory serves me right
Unmodified unpatched original Morrowind had this strange bug where a goblin (can’t remember where, but he was in a castle) would sell you 5000 gold for 5000 gold. He would reset every day so you could continue this indefinitely. Then if you killed him you could then loot him for the accumulated gold you had sold him. (Let say you had done this 365 days it would net you 1 825 000 gold)
That game is one of my saddest histories. As a bit to young to play it I bought it and found it immensely boring just slogging through the dungeon at the start. Didn’t understand the weapon system. Eventually after several tries I got into the city proper but couldn’t handle that first boss fight. Put it aside and never picked it back up again. Still have the game somewhere. No PSOne tho’
Forgot about BRD. I also remember stranding in Ironforge begging for someone with the key to Upper Blackrock Spire to unlock it. Man that key was hard to get, and the gems did not even have a 100% droprate