PrinceWatercress plays The Legend of Zelda: A Link to the Past - Part 18 of 21

Before we head to Turtle Rock, there are a few things that we can do.

Light World Map (by JonLeung)

Dark World Map (by Alex Foster)

Since you've beaten the first six dungeons (you only need to beat the fifth and sixth), you'll be able to do something a little interesting.

Head to where Link's House is in the Dark World. This is the Bomb Shop, and you'll find a big pink bomb. This is the Super Bomb. Pay the 100 Rupees for the Super Bomb and it will follow you around. Much like the chest you had to give to the guy in the desert, press A when you want it to stop following you around. Of course, if it stands there, the countdown will start underneath your life bar, and once it goes to zero, it explodes.

Take it all the way back to the Pyramid at the center of the Dark World. You may have noticed a huge crack that wouldn't budge with your regular bombs or with the Pegasus Boots. As it turns out, the Super Bomb is the only thing that will do the trick. Lay the Super Bomb there, and you'll finally bust the crack wide open!

When you go inside, you'll find the Dark World's equivalent of the Well of Wishing. First things first, throw your sword in there. The fairy that pops up will be changed by the magic of the Dark World, but she's still a fairy. Tell her you threw the sword in there, and you'll get the Level 4 Sword, which is the most powerful in the game!

Before you leave, make sure you throw the Bow in there as well. When she asks if you threw it in, say yes. She'll tell you that she has something important that will give Ganon his last moments, and that she knows that the Golden Power is to blame for her looking like she does. She then tells you to defeat Ganon.

The Path to Turtle Rock

Death Mountain - East (Light World) (by JonLeung)

Death Mountain - West (Light World) (by JonLeung)

Death Mountain - East (Dark World) (by Alex Foster)

Death Mountain - West (Dark World) (by Alex Foster)

Head east and stop at the dead end, then use the Magic Mirror to return to the Light World. Now that you have the Hookshot, you can make your way past the huge gap in the bridge. The dark-colored rock at the southern-most tip of this area contains a teleportation tile.

Use the tile to go back to the Dark World, then go northeast. There are two caves. Enter the one on the left, and go west. Go up the stairs, follow the path and fall into the pit. Push the block and go up the stairs. Go down the pit to the east, and go up the stairs to the east. Go down any of the three pits, but keep in mind that the bottom-most pit will give you access to the two chests, which contain Bombs and 10 Rupees. Go up the nearby stairs. Follow the path. You'll be back outside.

From there, pick up the rock near the cave you just came out of and throw it. This uncovers a secret passage. Go in and use the Ether Medallion to uncover the secret paths in the bottomless pits (remember where they are!). Go across from where you entered, bomb the crack in the wall, then bomb the crack in the left wall. (The north wall leads to a large fairy who will refill all your health.) Head out and you'll be in an isolated part of Death Mountain. (There is a destructible entry point to the north that leads to a few fairies.) Head to an open space and warp back to the Light World with the Magic Mirror. You'll find a Piece of Heart. From there, head back to the Dark World and drop down. 

In the Dark World, the four-legged manticore-like creatures with the white manes will back away from you and spit fireballs at you, moving around like the bow and arrow soldiers in the Light World. You won't be able to block their fireballs until you get the Mirror Shield, which you won't get until you explore the seventh Dark World dungeon, Turtle Rock.

If you decide to check the series of caves in the Light World, you'll find out that one of them contains four fairies that you can use to refill your health and even get some revives in case a boss kills you.

If you go to the Light World near the Tower of Hera, you can finally explore the area to the west now that you have the Magic Hammer. There are some platforms with cave entrances that you can drop down to, but all you'll get out of it is a bunch of rupees.

You're ready to head to Turtle Rock. Head east, and you'll find a hill with three posts to hit with the Magic Hammer. Pound the right, center and left posts, in that order. This will trigger a teleportation tile. Stand on it, and you'll be on the top of the Turtle Rock dungeon. Use the Quake Medallion on the Quake Medallion icon on the ground, and the turtle's head will disappear, opening up the dungeon.