Fire Temple
First turn left and go talk to Darunia. Then jump to the left on the pillars and free the goron and collect the key that is in the chest behind him. Then exit out of this room and go towards the other door. While going across this bridge, go to the left while you're about half way across the bridge. Go over towards the door on that wall. Go in this room and free another goron and collect another key. Then exit out of this room. Before you head towards the bridge again, turn around and play the Song of Time and the block will be moved and climb up it and go through the door on top of the ledge. Walk up a ways and then get your shield out and defend yourself against the flying tiles that will come after you. Watch out for the Like Like don't let him get a hold of you. An easy way to kill him would be to use your arrows so you won't have to get near him. After you defeat him, go and destroy the Gold Skulltula and collect the token. Then exit this room. Go straight across to the other side of this room. There will be a false wall, bomb it and go through the door. In here, free another goron and collect another key. Then exit out this room. Then, from where you are, turn right and go towards the door that the bridge leads to. Go through it. Slide down the small ramp and turn to the right. Climb up the chain wall. Once up there, kill the keeses before they try to attack. Drop down onto the ledge and grab a hold of the block and push it until it falls of the ledge. Then jump onto the block and ride it up to a top platform. Go through the door up here. Destroy the Torch Slug and jump over to the ledge with the block. Push the block off, then get down and pull it to the end of the track. Climb up on the block then jump on the wall and climb up it. Go onto the platform closest to the diamond shaped switch. Hit the switch either with a bomb or with the hookshot. Then climb up on the other ledge and climb up on the wire before the fire comes up again. Then exit through the door on top. This room is a maze. In here, from the door, go straight right, free a goron and collect a key. Turn right then go straight up till you find another door. Enter that door. Walk carefully to the locked door and unlock it. Here, walk along the ledge, then jump onto the wire. Run as fast as you can and don't get hit by the following fire. Then at the end, jump onto the last ledge. Then climb up on the wire and open the chest, there's the dungeon map and then go out the door. Go through that door carefully to the same door as while ago. Repeat the same process, but at the end of the trail go through the door. This is the maze room from before. Jump onto the ledge with the Torch Slug. Kill it and then bomb the false floor. Go down the ladder, free the goron, and get the key. Climb back up and jump straight and press the floor switch. Then go to the right and free the goron and collect the key. Once you have the key, go back to the room where you ran from the trailing fire. Go in the door with the lock on it. Go through this corridor. In this room, go to the right and go through the door on the right. Open the chest, there's the compass. Then go back out and go back to the left. Go to the door with the lock on it. Pass this goron up you'll free him later. Go left, activate the floor switch, then head on left towards the door that was surrounded by flames. Bomb the fake door. Go in and destroy the Flare dancer. To defeat it, throw a bomb at it and then strike it with your sword. Then, after it is destroyed, jump onto the middle platform. Then go through the door to the right. Climb the wire, then activate the floor switch and then climb up the other wire on the wall. Exit out the door. Climb up on the ledge and activate the floor switch. Then walk around the path towards the chest. It's the Megaton Hammer. After you get the Hammer, go back to the beginning of this room and hit the goron faced floor tile near the entrance door. Jump down the hole that was where the floor tile was. Use the hammer to hit the blocks out of the way and go through the door. Hit the block in the center top of the hole grab a box and go down the steps. Put the block on the switch after its activated. Go through here, get on the tile and hit it with the hammer. Climb on the platform, hit the rusty switch, go through door. Go near the big blue block and play the Song of Time. Jump on the block and jump towards the switch. Activate the switch, and free the goron below. Collect the key, then jump back on the block and go back through the door that you first came through. Jump onto the opposite raised platform and hit it with your hammer. Jump on the platform as it falls down. Go to the entrance of the Fire Temple and go to right of the stairs, use the Megaton hammer to hit the blocks out of the way and go through the door. In here, kill all the Keeses and the Torch Slugs. Then go through the door, free the goron and get the Boss key. Go through another door, here is another Like Like, destroy it and then collect the Gold Skulltula token too. Then go through another door, and destroy another Flame Dancer. Go through the now open door and go back through the door towards where Darunia was. Then go through the Boss door.
Boss: Volvagia
To destroy Volvagia, when its in the air, hit it with a arrow or your hookshot. Then when it's on the ground, as soon as it comes up out of a hole, hit it with the Megaton Hammer and then strike it with your sword. Repeat this process until it is destroyed.