Where do you find the boss key in forbidden woods legend of zelda windwaker?

Meh, this one is a little difficult. In the Forbidden Woods, you'll find a flowery plant thingy. It's hanging by weird stringy things. If your low on Rupees, open the treasure chest on the other side of the flower, as it contains rupees. Once that's done, cut the strings with your sword, causing the flower thing to fall into the... Liquid. I'm not sure if it's water because the water is colored pink. Use your Deku Leaf to blow the flower in different directions down the narrow hallway. Climb up on the ledge, then enter the door. You should be in a room with a grassy path leading up to a platform. Use your boomerang to hit the switches. Hit them all, and they'll light up. Two monsters will fall down. Defeat them, and then the wooden gate will open. And huzzah, you've just got the key! Hope this helps!