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Kingdom Hearts: Advance?!
That’s right folks… Need proof? Not believing your eyes? Here:
This IGN scan shows off the game in battle. The game, rumor has it, is a card action RPG, cards being used in battle for certain abilities. Kingdom Heart 2 is set for a 2004 Japanese release, but no specifics on the when have been given about Kingdom Hearts: Chain of Memories: Just the where: GameBoy Advance. More about this game will be posted as it becomes available.
Source: http://www.ignpocket.com