So before we get started, I'm not going to allow super dungeons like the one from X-2. If it contains the game's superboss or is filled with enemies that are stronger than anything from the final dungeon, it doesn't count. I'm placing this restriction because this would quickly become a short list since a few dungeons in the series were designed to be hard as smurf as an extra challenge. I'm talking about a regular dungeon you dread because of difficulty from the enemies, puzzles, or maybe it has that one token boss you hate.