For all you stupid people.

Here are the US titles.

NES
Final Fantasy
Final Fantasy 2
Final Fantasy 3

SNES
Final Fantasy: Mystic Quest
Final Fantasy 2
Final Fantasy 3

PLAYSTATION
Final Fantasy 4
Final Fantasy 5
Final Fantasy 6
Final Fantasy 7
Final Fantasy 8
Final Fantasy 9

PLAYSTATION 2
Final Fantasy 10
Any others I don't know about for PS2, I didn't go past 9.

Ok. I believe that the NES FF1 FF2 and FF3 were the Japanese SNES(Or super famicon, whatever you people have over there) FF1 FF2 and FF3. Then the SNES 2 and 3 were the Japanese SNES 4 and 6. The American and Japanese FF5 were the same. From then on they were all the same.

Cecil, feel free to correct me, I'm trying to talk about something I don't know much about.