Find: Rune Blade, Plus Barrette, Powersoul, All Materia, 1 Elixir, Elemental Materia, Sniper CR, & Counter Attack Materia.

Go to the right and follow the path up when you have a chance. There's a Rune Blade in the chest up on the peak. Come back down and proceed left. Before the bridge, follow the small road to the right of the rock. Take the lower path and wind around until you reach a chest with a Plus Barrette. Go back and follow the bridge up and to the left.

Walk down the stairs, then climb down the three ladders to the bottom. Save. DO NOT walk up to the blue guy just yet for he is the Materia Keeper boss. Now climb all the way back up to where you came in. The reason you climbed all the way down first was to flip all the ladders into the down position.

Climb in the pipe marked 2. Get the Powersoul sitting on the rock in front of you. Climb all the way up again, and go in pipe #4. Get an All Materia from the chest. Jump off the ledge and follow the path south. Run down the mountain and go into the cave to the right. Go up and to the right but don't go out the exit. Enter the small cave on the left, and wind down and around to the left to get the Elixir. Exit the cave and go to the Materia fountain. Grab the Elemental Materia to the left, and enter the cave that is at the back and to the right.

Follow the path right and up, then circle around left to get the Sniper CR. Go back right, and exit in the last passage going down. Follow the winding mountain path to the left, and you'll end up at the reactor. Take the door on the back wall, and you'll end up by the five pipes again. Save, and fight the Materia Keeper.

Make sure to pick up the Counter Attack Materia that he leaves behind. Now exit the cave to the World Map.