After you get the White Sword, continue on to the second dungeon.
There is a big lake in the center of the map. Dungeon 2 can be found on the west side of the lake, hidden under an armos statue.
Get a Key
Go north. Kill the Gibdos to get a key.
Get a Second Key
Go north. In the room with the Zols, go north. Get the key from between the two fireball-spitting statues.
Get a Third Key
Go north. In the room with the Gibdos, go north. In the room with the Keese, bomb the east wall and go through to get a key. Then go west.
Get a Fourth Key
If the north door is not open, kill all the Keese to open it. Go north, then kill the Manhandla to get a key.
Get the Map
Go east from the Manhandla room, then go through the locked north door. Be careful of the spike traps around the walls, then kill the Zols to get the Map.
Get the Whistle
Go south from the map room, then in the room with the Darknuts, go south. In the room with the Keese, push the south wall to go through a hidden passage in the wall. Then go down the stairs in the middle of the spiral to get the Whistle. If you find that you are having trouble completing this dungeon, the whistle makes it possible to get a couple more heart containers, as well as potions. Read More Heart Containers for more information.
Get a Fifth Key
Go back upstairs, then push the middle of the west wall to go through a hidden passage in the wall. If the south door is closed, kill the Gibdos to open it. Go south. Then go east through the locked door. Kill the Pols Voices, Gibdos, and Keese to get a key.
Go east and kill the Darknuts to get bombs.
Get a Sixth Key
Go south, be careful of the spike traps at the walls, and kill the Keese to get a key.
Get the Compass
Bomb the middle of the west wall and go through the hole. Kill the Darknuts to get the compass, then go east.
Get a Seventh Key
Go south and kill the Zols to make the doors open. Get the key.
Get a Blue Rupee
Go south and kill all the Gibdos to get a blue rupee.
Get More Bombs
Go down the stairs and follow the passage until you are upstairs again. Kill the Darknuts to get bombs.
Go north through the locked door to find the dungeon boss: Gleeok. Hit its heads to damage them. When one head starts flying around and spitting fireballs, hit the the head that is still attached to Gleeok's body until Gleeok dies. Get the heart container, then go north to get the Triforce Piece.