Hidden Poe

You now find yourself on the ledge around the courtyard. You may cross the courtyard via the damaged ledge to your left. On the destroyed wall, notice an opening that looks like a perfect target for your clawshot. Use the clawshot to swing through to the adjacent room. Through this door, you will need to use the chandelier trick to get across the room. Once accomplished, there will be a chest with a small key inside. Backtrack through the door and head to the ice room in which you previously defeated a hidden Poe. There is a locked door that can now be opened with the key.

Throw the ball and chain at the ice breathing beasts, but from a safe distance. Push the blocks in the back wall and you will have access to a previous room.

Follow the path and through the door on the right. Push this block, grab the cannonball and head back through the door. To get the cannonball to the other side, use the holder and handle trick like you did previously. Head up to the top of the room with the cannonball in tow and break this ice room, revealing a cannon. Aim the cannon at the cages that held the ice beasts. Put the cannonball in the cannon and drop it to the room from before with a bomb. Transfer the cannonball through the door and carry it to the cannon. Blow up the beast with a bomb and carry on with your day.