I got the boss key LONG before I actually beat the temple. I hated that room all the way to the east, the little water-maze-type thing.
I was always wondering how the crap I was supposed to raise the water level so I could get to the boss door, but then I referred to a walkthrough (this site...
Believe it or not, I thought it was the 2nd hardest in the game (City in the Sky was #1 hardest, but I'm ashamed because I beat it in 1/2 an hour cause I used a walkthrough :( ). I was stuck on it for about 3 months. It's the best water temple I've played so far tho. OoT's Water Temple was...