Games made by Square, or Final Fantasies in particular?

All the dungeons in Final Fantasy II were horrible. Thank goodness for those hidden walls in alot of the later dungeons, ugh...at least the final dungeon was filled with awesomeness.

Final Fantasy III had some rough moments, like the Mini/Toad only dungeons, and the splitting cave.

Final Fantasy VII had some uber-confusing pre-rendered backgrounds. Let's not even start on Gaea's Cliff and the snow cave...

Final Fantasy X-2 had some confusing puzzles for me as well. Most of them were just pulling/pushing switches to open up things that are never really explained properly, but on the other hand, the time running around trying to figure out what to do gave me lots of level ups...