Gex: Enter the Gecko

Various Cheats
Pause gameplay, hold L2 or R2, and enter any of the following "Codes" using Up = U or N, Down = D or S, Left = L or W, Right = R or E, Triangle = A, Circle = O, and X = X:
Code
Effect
undead
Infinite Lives
weasle
Invulnerable
aloud
One Liners
senseless
Rambling Gex
earwax
Timer
Debug Menu
Pause gameplay, hold L2 or R2 and press Left, Circle, Up, down, Right, Right, Left, Triangle, Up, Down. Unpause gameplay and press Select to view the Debug Menu.

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 Ghost in the Shell

Note This game is also titled Koukaku Kidoutai.

Hidden Kusanagi picture:
Finish all missions without continuing to view a bonus
picture after the ending credits

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 Goal Storm

Easter Island Heads
At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, Square, Circle, Start.
Revolving camera mode
Enter Up(2), Down(2), Left, Right, Left, Right, Triangle(2), Start when "Press Start" appears at the title screen.
Press Select during a game for additional camera modes, including a close-up mode that only displays one or two players. In this mode, the invisible players are present, but are off-camera.

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 Gokujo Parodius

Level Select
At the Title screen, press Square(5x), Triangle(7x), Circle, Circle, Circle.
Invincibility
Pause the game and press Triangle, Triangle, Right, Left, Right, Left, Down, Left.
Max Power
Pause the game and press Up, Up, Down, Down, Down, Left, Right, Left, Right, X, Circle.

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 Golden Goal '98

Extra Teams
At the Team Selection screen, enter any of the following "Codes":
Code
Team
L2, L2, L2
All-Time Team
R2, R2, R2
Special Team
R1, R1, R1
Brazil 1970 Team
L1, L1, L1
England 1966 Team

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 Golden Nugget

More Money
Go to Video Poker, and begin playing. First raise the game to 100 doller coins, and now put in all or as much money as you want without touching any cards. Once you have put in the money you want, press the pay button. When it shows all the money being paid to you, leave the game. When it shows you how much you won, you will see that you won a few thousand or even million depending on how much money you put in.