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Press Left, B, and 'Select' together at the 'Title' screen to recieve support from a character who will fly over the screen and drop some health whenever you dip under 3 points of health while the boss exceeds 16. Note: You will hear a different sound confirming correct code entry when the game begins.
Complete guide to Batman Arkham Asylum with the locations of all 51 riddles and how to get them.