Kingdom Hearts Birth by Sleep

Kingdom Hearts Birth by Sleep is an action role-playing game that introduces a gameplay aspect called the Command System, which allows players to customize a Command Deck with techniques and abilities that they can perform at will, called Deck Commands. Performing ordinary attacks and Commands fills a gauge displayed above the command deck. When certain requirements are fulfilled, the gauge activates a Command Style that changes the player's basic attack command to the Surge command, which racks up powerful combos depending on the Command Style that is active. Filling the gauge a second time causes the character to change into an even higher level Command Style, which replaces the Surge command with the more powerful Storm command. The story begins in the Land of Departure, where three Keyblade wielders and close friends, Terra, Aqua and Ventus, train to become Keyblade Masters under Master Eraqus. After the Mark of Mastery exam, creatures called the Unversed begin to appear in other worlds. The game was developed by Square Enix for the PlayStation Portable in 2010.