8. Kingdom Hearts: The Seeker Of Darkness Chronicles
Even if you have played all of Kingdom Hearts, you may not have heard this title, and that's because it's not really a game title. It's a collective name for the series from Kingdom Hearts right through to Kingdom Hearts III. It was initially named "The Xehanort Saga" after the main antagonist, but it was changed to the current title, to let us know that Xehanort isn't dying any time soon. The guy who it is now named after doesn't appear himself in two of the titles in the chronicle (though others resemble him).