In the room with the torches, stand on one of the hookshot targets (at the inner edge) and use it to fly up to the level above. Hookshot targets have now appeared all over this section. Shoot the tablet on the wall with your hookshot to get a red rupee, then exit the room.
Defeat them to make a treasure chest appear. You'll have Lizalfos to deal with as well. The spikes will retract, opening it up to a cutting. Small room, west, 1F: Lock on to the spiky enemy and walk into it with your shield held out in front of you. Torch room, west, 1F: Light the torches with your bow and arrow (or Din's Fire) to open the door and go through. Exit the room and drop down into the hole. Inside, defeat the three Stalfos knights for a chest to appear. Light Din's Fire to open the locked door in the room you are in.
