http://www.finalfant...cordkeeper.com/
https://play.google....west.FFRK&hl=en
I was shown this game Sunday by our local koala. Basically you redo battles from all of the Final Fantasy titles, and as you go you unlock characters from each. You can have parties made up of characters across all of the games, which makes things pretty interesting.
It's a freemium game, but so far that hasn't been an issue.