First pause the game.  Then press and HOLD the r1 button. 
then enter one of the following codes to get the desired result.

Infinite Lives - up, circle, triangle, down, right, square, down.

Fire Balls - X, up, right, up, right, right.

Ice Balls - circle, circle, left, down, circle, up, right.

Electricity - right, left, right, circle, triangle, right, circle, down,
              right.

Instant Speed - down, pause, right, right, down , up, pause

Super Jump - X, cirle, up, up, down, right, right.

INVINCIBILITY - X, square, down, down, up, down, right.

Remember to keep holding r1.  the game will unpause if the code is
entered correctly.   have fun !!!!!    
                                         Michael M. Burch
                                         tree@mail.one.net


PASSWORDS
=========
Cemetery:
SVZFKHGP
BXRFYHGP
ZVTCYHGP
Jungle:
KXVKRHKP
CVHCSHKP
SVKLPHKP
CVBLPHKP
Toonville:
RVTCSHGP
XVVBRHKP
Kung Fu Land:
YTCHPHKP
ZTDHPHKP
DXVGRHKP
Rezopolis:
GYVYRHKP

if you want to play the bosses of each level, you have to begin play with
a password which will put you pre- them in the game.  if you don't care
about that, you can access any of the earlier levels by beginning with the
Rezopolis password.

--john

Just finished GEX for the PSX, the code for all levels complete,
including planet X, is....

PZYPRXYL

Only thing left to do is kill Rez and make some popcorn to eat while
you watch the ending.

-Dreamer