What is the hardest FF to solo run?

[Angel of Iniquity]

I have never tried a solo run, sounds pretty dull to me...

Well, when you "master, or 100% a game", it losses reason to play it again, especially if you know it's gameplay through in out. So, to revamp the challenge and breath the game new life, you limit the abilities.

Same for other genre games. Indy 500 Endurance race with an gillet vertigo or Furai 2008 Concept in Gran Turismo 5.

When a game goes dull, revamp it up.