I've run through the dungeon in Knotted Forest many times, but I'm missing a key for the Boomerang chest. I've got the one that need to fall to get in the forest and the other at the end of the 2nd entrance. Did I miss an obvious one?
By the way, I just wandered around and was able to get the Magic Wand and Silver Arrow from other dungeons without the Boomerang! But then without Boomerang I was stuck and could not start the second dungeon.