KEYS: 6
After the Dark Nuts, go to the left and kill the Keese for the compass. After that's complete, go down a screen and fight more Darknuts. After they're gone, go to the stairs. Here you'll get the raft. After you've received the raft, go up two screens Here you'll get the THIRD AND FORTH KEYS from the puffs.
Next, go to the right and kill more Zols for the FIFTH KEY. Then head up. Then you'll have to kill more Zols, and after you've done this, move the stone and go to the left. Go to the left and kill more of the enemies for the SIXTH KEY. Then head back to where you got the FIFTH KEY right the down two times, here you will have to kill more of the Zols for the map. (Note: Why would you need a map at the end of the dungeon)??
Go down and find more of the Dark Nuts. Kill them just as you killed the others.Then go to the right and then be prepread to fight. A rush of enimes will try to kill you. If you survive this, go up and fight the boss, Mandandlas. To defeat the boss, use your bombs and your sword to kill all of its four heads. After you have done this, collect the heart container and then head north for the third piece of the triforce.