in order to get the sixth crystal, you must first get the flute. to get the flute go to the second world where there is a surrounding of trees on the map. you will meet a guy who gives you a shovel and asks you to find his flute. After achieving the flute, you have to take it to the town in the first world where there is a statue of a rooster perched on a post. Play the flute at the south end of the statue and it will turn into a bird. If you play the flute again, a bird will swoop down and take you to several places on the map. assuming you have the golden mits, warp to the spot on the bottom left corner of the map. You will find a warp underneath one of the rocks.

... Let's not descend into mob warfare here, people.

up in the mountains where you got the sixth pendant. Up there, there should be one of the portals that takes you to the dark world. In the Dark World, work your way East. you should eventually find a turtle looking cave. this is the dungeon with the last pendant.

i mean third pendant, not sixth pendant.

you go to the sixth tower duh my stupid bro submited this ^.