Play as Reptar:
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Hold L + Z + C-Up + C-Down + C-Left + C-Right at the
character selection screen.
Secret level:
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Hold Z and press R, A. This brings up a password screen.
Press Z, A, A, B, R, L. This will bring you to a secret
level in Angelica’s Temple.
Hiden Level:
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At the title screen, hold Z and press R, A to display a password screen.
Then at the password screen, press Z, A, A, B, R, L to start the game at
a hidden stage in the Angelica’s Temple level.