Gex 3: Deep Cover Gecko

Pause gameplay, hold L2 and press:
Invulnerability - DOWN, UP, LEFT(x2), Triangle, RIGHT, DOWN.
Select One-Liners - DOWN, RIGHT, LEFT, Circle, UP, RIGHT, then press Select for one-liners.
Debug Mode - UP, Circle, RIGHT, UP, LEFT, RIGHT, DOWN (press Select for Debug menu).

When you have access to the vault, press:
10 Lives - Square, X, Circle(x2), Triangle, Square.
1 Life - Triangle, Circle, Star, Square(x2), X.
Invincibility - Square, Star, Triangle, Square, Triangle, Diamond.
Play as Alfred - Square, X, Triangle, Square, Star(x2).
Play as Cuz - Square, Diamond, Square(x2), Triangle, Diamond.
Play as Rex - Square, Star(x2), Square, Triangle(x2).
Gex Video 1 - Circle, Triangle, Square, Star, Diamond, Star.
Gex Video 2 - Diamond, Star, Square, X, Triangle, Circle.
Gex Video 3 -  X, Diamond, Star, Triangle(x2), Circle.
View All FMV Sequences -  Star, X(x2), Circle, Square, Triangle.
Eight Hit Paws - Square, Diamond, Triangle(x2), Star, Diamond.

98% Complete
Password: Square, Circle, R1, Triangle, L1 R1, L1, R1, Circle(x2), R1 Triangle, L1, R1, Circle, L1, Triangle, Circle, R1, Triangle, L1, R1, Circle L1, Triangle, Circle, R1, L1.

Best Ending
Password: R1, R2, X, L2, Square X, Square, R2(x3), X, L2, Square, X, R2, Square, L2, R2, X, L2, Square, X, R2 Square, L2, R2, X, Square.

 