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MOBILE GAME SYSTEM AND METHOD USING KEY BUTTONS WITH AN AUDIO SIGNAL OUTPUT FUNCTION, PARTICULARLY FOR ALLOWING A USER TO PLAY GAME BY OUTPUTTING AN AUDIO SIGNAL CORRESPONDING TO EACH KEY BUTTON
MOBILE GAME SYSTEM AND METHOD USING KEY BUTTONS WITH AN AUDIO SIGNAL OUTPUT FUNCTION, PARTICULARLY FOR ALLOWING A USER TO PLAY GAME BY OUTPUTTING AN AUDIO SIGNAL CORRESPONDING TO EACH KEY BUTTON