Bugs Bunny: Lost In Time Codes -

Maximum carrots:
Hold L2 + R1 and press X, Square, R2, L1, Circle, X, Square(2), Circle at the time selector or level selector screen.

Level select:
Hold L2 + R1 and press X, Square, R2, L1, Circle, X, Square(3) at the time selector or level selector screen.

All abilities:
Hold L2 + R1 and press X, Square, R2, L1, Circle, X, Square, Circle, Square at the time selector or level selector screen for the following abilities: Hocus-Pocus (fly after getting a fan), Open Sesame (opens secret doors), Olly-Olly-Oxen Free (super-jump), Magical Tune (Bugs whistles).

Full energy:
Hold L2 + R1 and press X, Square, R2, L1, Circle, X, Square, Circle(2) at the time selector or level selector screen.

Suicide:
Hold L2 + R1 and press X, Square, R2, L1, Circle, X, Circle(3) at the time selector or level selector screen.

Extra key:
Hold L2 + R1 and press X, Square, R2, L1, Circle, X, Circle, Square(2) at the time selector or level selector screen.

View complete ending sequence:
Hold L2 + R1 and press X, Square, R2, L1, Circle, X, Circle, Square, Circle at the time selector or level selector screen.

View incomplete ending sequence:
Hold L2 + R1 and press X, Square, R2, L1, Circle, X, Circle(2), Square at the time selector or level selector screen.