I'm gunna have to say Forest temple, simply because I missed a key and got super confused/frustrated.. I actually have no idea how I messed up so badly, but in the end I figured it all out and got to the Boss, which was another part I found extremely difficult. I must have died a good 7 or 8 times trying to beat that, definitely got veery frustrated with that. My opinion is pretty biased though seeing as I didn't even attempt to take on the water temple solo, I did it step by step with the walkthrough, I was so scared of having to restart my whole game if I messed it up. Is that actually true that if you screw up the temple you can never move on in the game? I've just heard that before. (Don't hate on me please, I'm a huuge n00b to Zelda, so I have a lot of questions that you all might see as stupid) Anyway, I'm working on the Shadow Temple right now, when I'm done the game I'll have to post here again if my opinion has been changed.