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This is a confusing place, so I'll try to make my instructions as simple
as possible. Drop off the ledge to the lower area. Go north a bit, then
open the chest at the left to get the map. Then continue north to the
next room. The chest you see there contains a single red rupee. Staying
on the lower area, go around and go to the next room to the right. Then
go straight to the next room to the south.

Go up the steps to the upper area of the room. Make your way to the
treasure chest and open it to get the dungeon's compass. From that
point, drop down to the lower level and go to the next room to the left.
Open this chest and you will find the big key.

Go to the east room, then go to the north room. Now climb the steps to
the upper area. Make your way to the north side of this room and go
through the door that requires the big key.

Go north through this room (defeating any Stalfos along the way). Lift
the skull pot at the upper-right corner to get a small key. Then go back
down and go left through the locked door to the next room. I try to
avoid these enemies, a single touch from them costs you TWO hearts! Go
straight through this room and on to the next.

Defeat the cloud-like creatures in this room (just defeat the small part
and the big one will disappear as well). You can sprinkle magic powder
on the red-bubble enemy to turn it into a fairy! Go left to the next
room. Make your way north over the conveyer belt (against the current),
defeating the enemies along the way. In the next room, get the small key
from under the skull pot. Hit the crystal orb, then carefully slip past
the spike traps and go up the stairs.

Lift the bottom-right skull to reveal a switch, then step on it to open
the door. Continue on to the next room. Dash straight through this
corridor and go through the door to the next room.

The chest in the corner contains some bombs. Stand between the two
wooden tables and face north. Place a bomb on the ground, pick it up
(with the A button), and throw it forward. It should land on the cracks
and blow open a hole in the floor, allowing light to shine down to the
1st floor.

Now backtrack all the way to the first floor. Go to the room with the
long conveyer belt. From here, go to the room at the right (passing over
the lowered blue block). Zip past this room and continue to the room at
the right. In this room full of conveyer belts, make your way to the
north side and go down the stairs to the basement.

Defeat ALL the enemies in this room to open the door, then go inside. Go
south in this room over the conveyer belts. Be extra careful not to fall
off into the sides or touch the enemies (you can kill the jellyfish from
afar with the hookshot). Go in the door at the right. Go straight right
through this room and you'll reach some kind of prison. Walk right
through all the locks (they don't require any keys) until you reach what
*appears* to be the dungeon's maiden.

Doesn't this seem suspicious to you? This girl will follow you from now
on. Anyway, take the small key from the chest and backtrack to the room
with the long conveyer. This time, go through the locked door at the
left. Quickly whip out your hammer and smash one of the "digletts" into
the floor, then open the big chest to get this dungeon's treasure:
Titan's Mitt. Now quickly get out of the room before you get trapped in
the center. From the long conveyer belt room, go through the door at the
upper-right...then go up the stairs to floor B1.

In the full-of-conveyer-belts room, lift the skull pot at the
upper-right corner to reveal a switch. Then step on the switch to open
the door at the right. Go inside.

Go north to a seemingly empty room. There's light shining in the center
because of the hole in the floor you blow open in the above level. Now
let's think for a moment: This is Blind's Hideout, and you just picked
up a mysterious girl from the basement. That girl is Blind the Thief.
And do you remember what the person in the Light World said? "Blind
HATES the light".

Go forward so that the light shines on the girl. She transforms and
reveals her true identity. It's this dungeon's boss: BLIND the THIEF.
See the boss section of this FAQ for details. After you've defeated him,
get the heart container and the fourth crystal. There are 3 more
crystals to go.