Mirage Arena

The Mirage Arena is a new world introduced in Kingdom Hearts Birth by Sleep, specifically for the game's Multiplayer Mode, Joint Struggle. Only appearing in this mode, no story information exists for this world.

Joint Struggle
In the Mirage Arena, a gameplay mode for up to three players known as Joint Struggle is held. Here, players can interact in the Lobby and later battle the Unversed as a team. Joint Struggle features unique abilities only available through it, and allows bonuses to be obtained for Story Mode.