I recently discovered that Final Fantasy IX is multiplayer. I haven't tried it out yet, though. You have to go to Battle Control in Config, and choose which controller is linked to which character. 1-2 players only. This works better only in ATB.

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"BLAST IT! THAT WAS A RECIPE FOR SCONES PASSED DOWN BY MY MUMSY!
-England getting mad at America for insulting his scones

Well it isn't full multiplayer, it's just a feature that's only available during battles. Exploring and progressing through the story is still very much a single player experience.

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Yea, a similar multiplayer system was in the SNES/PS1 versions of FF4 5 and 6. The only difference is that the 1 and 2 player controls are specified to a character slot instead of a character.
I've actually done this in FF6 with my brother (whom at the time had only played FF10 and was still learning) and it works rather decently. You just have to remember who you are controlling (although in FF9, they actually show a controller symbol to show you who needs to make the action). Just remember that you have to utilize your skills as well as your player 2 (as I find it gets rather hard sometimes to deal with someone else's style in an RPG)

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Mhm, it's only multi when it comes to the random battles, other than that, primary control remains with Player 1. It doesn't exactly work that well as a co-op experience considering it's all turn based, but it's a fun little feature even though I reckon hardly anyone knows about it, let alone uses it

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My dad tried it with me when i was like 6, and i wasted 2 hours of his battles getting him killed.

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385/2 Days