beat Riku
You can beat Riku by using 0 cards or 9,8,7,6,5 cards you can also use combos but the best way is to get the shild card (the heartless from Hollow Bastion with the shild with the face on it.)
Hopes this works thats how I beat him.
Theres loads more info this game, right here, with some cheats and tips, answers and Kingdom Hearts: Chain of Memories walkthrough.
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