Arena Mode



Joint Struggle is the name of the new multiplayer mode said to be featured in Kingdom Hearts Birth by Sleep. You will have to be able to use wireless LAN to be able to play in multiplayer. In this mode, up to three players can take on the role of Terra, Ventus, or Aqua, the Keyblade warriors wearing their armor from the secret ending of Kingdom Hearts II Final Mix, rather than their usual gameplay attire.

The names of who is playing with you appear above their respective character and while fighting their HP is displayed like someone who is in your Party.

Gameplay
Through a new world called the Mirage Arena, three players can access and engage in battles for cooperative play. It should be noted that the Mirage Arena is a world exclusive to Joint Struggle and you’ll have lots of different things to explore while playing.

You will be able to transfer things between multiplayer and single player. Items and any sort of character growth you’ve done to your character will be able to be brought over. There will be a lot of saving friends who have been locked away, reviving fallen friends by continuously pressing O, and other cooperation type of things. There are rounds in the arena battles and a mode where enemies keep coming until you finish them all off.

Some abilities will only be available while playing multiplayer. Some of these examples are "Ice Barrage", "Provoke", "Heal Light", "Vanish", "Friend Cure" and "Cyclone" commands allowed for use.

After finishing you will receive medals on the result screen.

Trivia

 * This is the first time that Terra, Aqua, and Ventus have ever been playable in their armor, let alone their normal in-game attire.
 * While in the Kingdom Hearts II Final Mix secret ending, the three Keyblade warriors' armored suits were a combination of browns, grays, and other dull colors. In Joint Struggle, however, Aqua's armor is red, Ven's blue, and Terra's yellow. The reason for the color change is currently unknown.
 * Kingdom Hearts Birth by Sleep is the third game in the Kingdom Hearts series to feature a multiplayer mode. The first was Kingdom Hearts: Chain of Memories, and the next was Kingdom Hearts 358/2 Days.