I have an FFVII file on an old PS1 memory card where, in addition to doing everything else conceivable that the game has to offer, I mastered every single materia in the game, got three sets of the Master Summon/Spell/Command materia and I mastered the KotR materia eight times. I did this legitimately, with no cheating devices.

I fell for a very elaborate "revive Aeris" rumor back in middle school, because I saw it on the internet so IT MUST HAVE BEEN TRUE!