Well, this is 3 FFX challanges from Ultima Shadow inc. They are divided in 3 different skill levels. VERY good, expert and elite.
Skill level: VERY good.
Beating the game without changing weapons or armours. That means that you can only have each characters start armour and weapon trough the whole game. Also, you must only get the in-story aeons. So no Anima, Yojimbo or Magus sissters.
Skill level: Expert.
Beating the game without changing weapons or armours + each character is only allowed to activate hp and ability nods. That means that you can only have each characters start armour and weapon trough the whole game + only hp and ability nods will be activated. And the Aeons will only be allowed to learn abilities, nothing else. Also, you must only get the in-story aeons. So no Anima, Yojimbo or Magus sissters.
Skill level: Elite.
You can use whitch ever weapon or armour you want but the celestial weapons and you use all the characters... BUT you'r only allowed to learn the Abilities in the sphere grid. This means that you will not be able to activate strength nods, HP nods etc ONLY ability nods. It's the same for the Aeons... you will only be allowed to learn their abilities, not use strength spheres to power up def, hp and str etc. Also, you must only get the in-story aeons. So no Anima, Yojimbo or Magus sissters.
Yea, it's possible.