I never cheat for any Final Fantasy games, except IX (Where I got stuck and used a walkthrough to find a weapon or something). But otherwise I never use a guide even if I appear to be stuck. I just randomly walk around until I find out what to do.

For other games, though, the only game I cheat with is GTA Vice City. Because it is far better with cheats than without ^_^

I havn't finished with FFTA yet.... I'm about half way. Or less.