Arena Mode

Arena Mode (アリーナモード) is a feature that appears in Kingdom Hearts Birth by Sleep. It allows players to fight a series of set matches against enemies. It can be played either as a single-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 Kingdom Hearts HD 2.5 ReMIX version, Arena Mode is only available in single-player mode, due to the removal of a multiplayer function. The difficulty of the matches has been toned down to accomodate solo fights.

Mechanics
In the Hub area, players choose a battle and proceed by standing in the center spot. Each battle has a Risk (ランク) rating between 1 and 5 stars, showing the difficulty.

When playing with friends, players can team up when using certain Friendship commands to deal more damage. If a player's HP drops to 0, other players can revive that player by repeateadly pressing to fill a gauge and trigger Healing Light (ヒールライト).

At the end of a match, players are ranked in three categories: Damage, Friendship, and Style, with 1st place getting 2 points, and 2nd place getting 1 point. The player with the most points is crowned the MVP, and has the number of Medals earned multiplied by 1.5. The Damage category is determined by which player dealt the most damage to enemies. The Friendship category is determined by which player has used the most Group Cure or Group Esuna commands, and has pressed the button the most during Healing Light. The Style category is determined by which player activated the most Command Styles and Shotlocks. In Kingdom Hearts HD 2.5 ReMIX, the ranking has been replaced with a specific Bonus Challenge for each match, which multiplies the earned Medals when achieved.