Go to the Bomb Shop in the Dark World (it's the building that used to be
your house in the Light World). In addition to the regular blue bombs, there's also a special pink super bomb! Buy the super bomb for 100 rupees. This bomb follows you behind you back until you press the A button or drop off a ledge.
Go outside of the shop. Use the Magic Mirror to transport to the Light World. Now head for Hyrule Castle and use the teleporter at the gate to go back to the Dark World. Now you're in front of the big pyramid.
Climb
the steps up the pyramid. See the big crack in the wall? Set the bomb in
front of that crack (press the A button) and get away. The bomb explodes
after 3 seconds, blowing a big hole in the wall. Go inside.
Step forward towards the fountain and you will be promted if you want to
throw something in. This is just like that good fairy in the Light World! Throw in your bow and arrow...a fat fairy appears. Answer her question honestly and she'll give you something better: The Silver Arrows. These are stronger than regular arrows and you need them to defeat Ganon. Repeat that process with your sword to get the golden sword (lvl. 4).
-- GETTING THE CANE OF BYRNA --
Use the Magic Mirror to transport to the Light World, then use the flute
and fly to map point #1 (on Death Mountain). Follow the path and make your way up the mountain, just like you did when going to the Tower of Hera. After you climb the tall ladder, go right and into the transporter.
Upon arriving in the Dark World, go straight down from where the transporter was and drop of the ledge. You'll land on another small ledge. Go inside the cave.
Smash the three digletts with your Magic Hammer. Now use the magic cape and follow the path of spikes. When you get to the end, open the chest to get the final item to complete your collection: The completely useless Cane of Byrna. That trip over the spikes probably cost you all your magic power. So use a green potion if you have one, and make the return trip. Then exit the cave.
-- GOING TO TURTLE ROCK --
Drop off the ledge and make your way back up to the top of the mountain.
Use the Magic Mirror at the correct spot so that you'll emerge on top of
the big rock. Drop off at the other side and go right...past the Tower