There are two criteria at play here first does it bear the Final Fantasy title in any form or region This covers most of what weve got Second if the first does not apply does it feature a major appearance by characters or settings strongly associated with the Final Fantasy series Kingdom Hearts does since about half of the major NPCs are from the series Ehrgeiz does since it has several playable characters one of whom is actually on the cover of the game from Final Fantasy VII Secret of Evermore might as well I was under the impression that the appearances were more along the lines of brief cameos that integral roles but if someone wants to argue otherwise Im listening Super Mario RPG does not fit under either of these categories it was never called Final Fantasy Super Mario RPG or whatever and it has but one piece of music to connect it to the series