Alexander Materia
I noticed that a guy said you couldn't get Alexander Materia, and that you could only use it with "master summon" Materia, well that isn't true.
To get Alexander summon, you go into the great glacier area, and find the hot spring, touch this and then find snow's cave, fight her, beat her, then you can pick up the Materia from in the cave.
Theres loads more info this game, right here, with some cheats and tips, answers and Final Fantasy VII walkthrough.
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