From Brave Nine Wiki
There are several Game Modes in Brave Nine including both PvE and PvP content.
|Campaign||Play through the story of the game.|
|Arena||Pit your strongest mercenaries against other players' mercenary teams.|
|Novice Arena||Similar to Arena, but without 5★ mercenaries and limited to a max of 3 4★ mercenaries.|
|Guild War||Battle and defend against other guilds.|
|Mystic Island||Collect Mystic Dust while pillaging and defending from other players.|
|Underground Arena||Face off against other players in real time.|