At the entrance, you'll find Mimoza the moogle.

In the lobby area, find a Remedy underneath the platform and a Rising Sun up the stairs. Exit through the doorway to the left on the top platform.

Pick up the Elixir and then activate the blue globe to turn it red. Return to the lobby. If you go right, you can buy from Stiltzkin but he'll disappear after you visit the room with the wall of faces.

Take the lower left-hand door. In this room, pick up a Diamond Sword, and Shield Armor. A holograph of a planet will appear. Go through the exit at the bottom.

Get the Power Vest and Feather Boots then go to the top-left projector and activate them in a clockwise fashion. Head out the top exit when finished.

Cross the bridge, and then examine the globe at the landing to see a slideshow. Continue on until you are back in the chamber with the holographic planet. Go through the now unlocked blue door. Inside a wall of faces will speak to you.

Return to the lobby again and take to door on the right this time. Mooel the moogle is here and you can pick up a Gaia Gear. Exit to the right.

Take the platform to the bottom. As soon as you examine the altar, you'll have to fight the Ark. After defeating it, take the Gulug Stone.