How Do Open the Safe in Nivelheim?
 
This is also how you get Vincent Valentine, Odin Materia, Cosmic Memory (RedXIII's limit 4th)
Instruction:
What most people forget when trying to open the safe is that it's just like a real combination lock...so you have to go in more
than one direction when inputting the numbers. Furthermore, unless you're fast enough, you'll run out of time if you try any other
combination. The code is:

 RIGHT TO 36, LEFT TO 10, RIGHT TO 59, RIGHT TO 97

This means that you hold right and scroll through the numbers, then hold left until you reach 10, then hold right for the last two
numbers. Don't forget to press O to verify each entry. When the safe opens, a Summon Materia (Odin) pops out, and you are
assaulted by a big goon (how'd he fit into that little safe?)