For you, whats the hardest puzzle walkthrough game ex: Metroid, Zelda

[TopCat8]

I've never been even close to beating a Zelda game, and I haven't finished any of the Metroid Prime Games. I have come close though. I have a whole bunch of games that I haven't beaten. It's a little depressing. But basically, OoT is the most frustrating game I've ever played.