Now that you have the Boss Key, head back to Room C. Now use the gears to get to the opposite side of the door that leads to Room B. Once you get to the other side, you will see a ladder and a lot of water pouring down on it. Use the Ice Arrows to freeze it and allow you to climb up it. Head through the door. You can get a fairy in here, but first we must turn another switch. Use the Ice Arrows to make platforms to get to the green switch. Turn it, and then head over to the yellow platform. Use an arrow to destroy the monster that is trying to get to you. Now, use the ice arrows and go over to the section that is closest to the hole in the ceiling. Use your hookshot to get up to the section on top. This may take a few tries to get it right. Now go over to the treasure chest and claim fairy #9. Now head to Room B.
Step 13: Room B
OK. Now, you are going to change the flow of water and explore the rest of the temple. Now, you should see a jet of water shooting up from the red jet to your right. Look above it and you see a Hookshot mark. Hookshot there and when the jet reaches its peak, jump over to the red switch. The wheel will now be stuck between the yellow and red pipes. Go turn off the yellow, and head back to Room C. Head through the other red-green tube.
Step 14: Room M
In this room, you can collect two fairies, and they are extremely well hidden. First, raise to the platform (watch out for Skull Fish), and jump on the vertical raising platform. Now, jump onto the wheel and balance yourself until the horizontal platform comes. Jump on it, and aim your hookshot towards the southwest corner of the room. You will see a torch in a room. Hookshot to the torch and you will see a treasure chest. Open it and claim fairy #10. Now, you want to stop the wheel itself. Now have your ice arrows in your hand, and go onto the vertical platform. Once it gets to the top, fire the ice arrows at the water. The wheel will now stop, and allowing you to get fairy #11. Now, jump onto the wheel, and go up the blade nearest to the room where the fairy is (it is to your left). Now hookshot yourself to the treasure chest and you will now get fairy #11. Now head across the wheel to the other side, take the large blade to the right and exit the door there.
Step 15: Room N
Room N is a bunch of seesaws. You can enter the last room and then head to the boss, but it will be helpful to collect the last four fairies. First, under the first seesaw, you see a barrel. Turn into zora Link and swim into it. Grab fairy #12. To get fairy #13, you need to get up to the green pipe. Now use the fire arrows and ice arrows to navigate your way through the seesaws. Once you get to the green pipe, jump to the first platform across from the treasure chest. Hookshot your way across to the treasure chest ad you get fairy #13. Now use the first seesaw to enter the final room.
Step 16: Room O
The door from Room N overlooks Room D. Swim through the opening in the northwest corner back to Room C. Now, enter the green opening at the bottom of the water and go into Room O. The last two fairies can be found in this room. First, you see one in a bubble in a pipe that leads back to Room C, so you will have to go back to Room C to get fairy #14. The last one is under the last valve that you have to turn. Shoot it with an arrow when your on the green pipe. It is easiest this way. Then coax it with the Great Fairy's Mask. Turn the valve, and you can now head to the Boss Room. But before you do so, go back and turn all of the fairies in. You will now have coated hearts, which equals to twice as many hearts! (so if you have 9 hearts, it will be like having 18!)
