Gex 3: Deep Cover Gecko
Enter the following as Passwords at the Vault Screen:
Extra Life:  Triangle, Circle, Star, Square, Square, X.

Ten Lives:  Square, X, Circle, Circle, Triangle, Square.

Invincibility:  Square, Star, Triangle, Square, Triangle, Diamond.

Level Select:  Square, Circle, Circle, Triangle, X, X.

Play as Alfred:  Square, X, Triangle, Square, Star, Star.

Play as Cuz:  Square, Diamond, Square, Square, Triangle, Diamond.

Play as Rex:  Square, Star, Star, Square, Triangle, Triangle.

See FMV Sequence: Circle, Triangle, Square, Star, Diamond, Star.

See FMV Sequence 2:  Diamond, Star, Square, X, Triangle, Circle.

See FMV Sequence 3: X, Diamond, Star, Triangle, Triangle, Circle.

See all FMV:  Star, X, X, Circle, Square, Triangle.

Turn Off The Timer  Square, Square, Diamond, Circle, X, X.

Mini Dracula Gex    Star, X, X, Circle, Square, Triangle.

ARMY Channel Mini-Movie X Diamond, Star, Triangle, Triangle, Circle

GANGSTER TV Mini-Movie Circle, Triangle, Square, Star, Diamond Star

WESTERN Station Mini-Movie Diamond, Star, Square, X, Triangle, Circle

Invincibility:
Pause the game, hold L2 and press Down, Up, Left, Left, Triangle, Right, Down. Gex should now be invincible.

Debug mode:
Pause the game, hold R2 and press Up, Circle, Right, Up, Left, Right, Down. You''ll hear a sound to confirm entry. Now unpause and press Select to bring up the debug screen.

Gex quotes:
Pause the game, hold L2 and press Down, Right, Left, Circle, Up, Right. Unpause and press Select to hear a witty Gex line.

Bonus Level:
Get all four remotes in 'Clueless in Seattle' and the pole and you will get the bonus level on top of the building in funky town.