Unlimited Batarangs:
Press L, R, White, Y at the main menu. A sound will confirm correct code entry.
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Bonus characters:
Press Left, Right, Down, White, L + R, then press Start at the main menu.
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Cheat
Go to the "Main Menu" and press L, R, L, R, X, X, Y, Y.
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Unlimited Electric Batrings
Go to the "Main Menu" and press L, R, B, White, L.
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