PS1 - Gex

Stage select
At the level selection dome, press R1 + Select. Then, press X, Square, X, Right, Up, Left, Circle(2), Down(2).

Access all levels
While in a stage, press R1 + Select. Then, press Circle, Start, Right, Up, Square, Left(2), Up, Start.

Ice power-up
Pause the game, hold R1 and press Circle(2), Left, Down, Circle, Up, Right.

Jump power-up
Pause the game, hold R1 and press X, Circle, Up(2), Down, Right(2).

Speed power-up
Pause the game, hold R1 and press Down, Start, Right(2), Down, Up, Start.

Fireball power-up
Pause the game, hold R1 and press X, Up, Right, Up, Right(2).

Lightning power-up
Pause the game, hold R1 and press Right, Left, Right, Circle, Triangle, Right, Circle, Down, Right.

Invincibility
Pause the game, hold R1 and press X, Square, Down(2), Up, Down, Right.

100 lives
Pause the game, hold R1 and press Up, Circle, Triangle, Down, Right, Square, Down.

Long ending
Pause the game, hold R1 and press Circle, Right(2), Down, Triangle, Down, Circle, Right(2), Down, Triangle, Down, Start. Now the extended ending of the game will be displayed. This is the ending is normally seen only after the Planet X level has been completed.

Level passwords
Level Password
Cemetery 1 SVZFKHGP
Cemetery 2 BXRFYHGP
Cemetery 3 ZVTCYHGP
Toonville 1 RVTCSHGP
Toonville 2 XVVBRHKP
Jungle 1 KXVKRHKP
Jungle 2 CVHCSHKP
Jungle 3 SVKLPHKP
Jungle 4 CVBLPHKP
Kung Fu Land 1 YTCHPHKP
Kung Fu Land 2 ZTDHPHKP
Kung Fu Land 3 DXVGRHKP
Rezopolis GYVYRHKP
Rez Battle PZYPRXYL
Planet X RYYRYXKB
Game Shark Codes
Joker Command D009823C ????
Infinite Lives 8009732C 0063
Invincible 80097BD8 0001
Infinite Gold Flies 80097AF8 0063
Blurr Mode 80097CCC 0001
Fireball Mode 80097BD6 0001
Moon Jump D009823C 0400
800D752A FFFB