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And the difference between standard and expert grids is their complexity. They both give the same abilities, but on the Expert grid there are tonnes of different paths to take and isn't as linear as the standard one.
Plus, the MP spheres, HP spheres and all the rest fill in empty nodes to HP/MP nodes - very handy, although they're hard to find.
And another cool thing - has anybody else got Lulu's various Cait Sith dolls? They're really cute!
Took me about 12 hours of gameplay to get that far.