utilizes a card-based battle system. A unique aspect to this game is "room synthesis": to advance through the game, the player must utilize Map cards obtained after winning battles to synthesize rooms. The properties of each room―including quality of items and strength of enemies―are determined by the Map cards the player chooses. Each card has a specific effect: red cards affect the number and type of enemies; green cards affect the power of the player's deck; and blue cards affect the properties of the room itself, such as allowing treasure chests or a save point to appear. The game features three modes of gameplay. The first two are story modes that feature either Sora or Riku, and the third is a two player battle mode. Initially only Sora's story mode is available; once completed, "Reverse/Rebirth" mode becomes available. Reverse/Rebirth allows the player to play a second story mode featuring Riku and a link mode where players can battle each other via a Game Link Cable. Combat Combat uses a card-based battle system executed in real time. The player can jump and maneuver around the battle screen as they would on the field map, but all physical attacks, magic, items and summonings are activated by playing cards. Cards are ranked from zero to nine, and are used for making attack combos or breaking enemy cards. With the exception of zero-ranked cards which are more expensive in terms of Card Points (CP) compared to other cards of the same type and have other ranks, more CP are required to place higher-ranked cards in the player's deck. Card Points—increased through level up—limit the number of cards the player can use in a deck. Cards with rank "zero" can break any opposing card or combo if played after the opposing card or combo, but they can be broken by any card or combo as well if it is played after the zero card is played. Breaking an opposing card will cancel that attack and stun the loser of a card break for a short time. Special enemy cards may be obtained by defeating enemies and bosses, and are used to give the player a temporary ability, ranging from enhanced offensive and defensive capabilities to modifying the attributes of certain cards. Combining cards in sets of three will create combo attacks that are usually more difficult to break because the rank of the combo will