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Arena Mode (アリーナモード, Arīna Mōdo?) is a feature that appears in Kingdom Hearts Birth by Sleep. It serves a similar purpose as the Olympus Coliseum cups, allowing players to fight a series of set matches against enemies. It can be played either as a one-player mode or as a multiplayer mode over a wireless connection with up to three participants. As with other events occurring in the Mirage Arena, players appear as Terra, Ventus, or Aqua, wearing their Keyblade Armor, rather than their usual gameplay attire.
Other players' HP bars are displayed above the protagonist's own sprite, similar to party members, and their names are shown above their characters.
In the Mirage Arena, three players can access and engage in battles for cooperative play. The Mirage Arena is a world exclusive to Arena Mode.
Through this multiplayer mode, items and other bonuses can be transferred between single and multiplayer modes. Unique elements of battle include rescuing friends trapped by the Unversed, and continuously pressing the button to heal fallen players. Players may customize their displayed name and the color of their armor. At the end of a completed playing session, winning medals are distributed on a results screen.
A rating system appears, showing a level of who stands in what place by displaying differently colored symbols.