Codes
In the game, press Start to pause, then hold the L2 or the R2 buttons. Us the following legend to spell out the below codes for the desired effects. Up=U or N, Down=D or S, Left=L or W, Right=R or E, Triangle=A, Circle=O, and X=X.
Infinite Lives: - Undead
Invulnerable: - Weasle
One Liners: - Aloud
Rambling Gex: - Senseless
Timer: - Earwax