A few questions about PSU

[Magician4]

1. Are rare items in this game?
2. Is extra mode like an offline version of online mode? (Like offline was on PSO)
3. Are their difficulty levels in this game? If not how do you get more exp in this game?

[Ether]

1. Yes
2. No. Extra mode is like story mode without the story
3. Online missions come in 4 versions, C B A and S-Rank. Higher ranks = higher level monsters