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In every world, Sora closes the keyhole so that the Heartless don't get any access to that world's heart, so that it isn't overrun by darkness and the world gets destroyed.So if sora had a key, that door would be the keyhole? I'm guessing a keyhole is the door to a worlds heart.
That voice was sexy as hell. Oooh, it sent shivers down my spine in a very nice way. Too bad they redubbed it in KH II and made him sound not-very-threatening at all.