Secret Act 1:
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Get an „A” or better rank on all twelve acts to unlock Secret Act 1.
Secret Act 2:
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Successfully complete Secret Act 1 to unlock Secret Act 2.
Bonus characters:
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Successfully complete the indicated task to unlock the corresponding character:
Chi-Chi: Successfully complete Story mode.
Fu Lum: Successfully complete Story mode.
Mai: Successfully complete Story mode.
Neo Piccolo: Successfully complete Secret Act 2.
Oozaru: Successfully complete Story mode.
Piccolo: Successfully complete Story mode.
Alternate costumes:
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While choosing a character at the character selection screen, hold L + R.