To access the following codes - pause the game, press and hold R1, and enter the following.

99 Lives:

Up, Circle, Triangle, Down, Right, Square, Down

Ice Breath:

Circle, Circle, Left, Down, Circle, Up, Right

Electric Spit:

Right, Left, Right, Circle, Triangle, Right, Circle, Down, Right

Flame Breath:

X, Up, Right, Up, Right, Right

Invincibility:

X, Square, Down, Down, Up, Down, Right

Super Jump:

X, Circle, Up, Up, Down, Right, Right

Passwords

SVZFKHGP - Cemetary Level 2
BXRFYHGP - Cemetary Level 3
ZVTCYHGP - Cemetary Level 4
KXVKRHKP - Jungle level 1
CVHCSHKP - Jungle Level 2
SVKLPHKP - Jungle Level 3
CVBLPHKP - Jungle Level 4
RVTCSHGP - Toonville Level 1
XVVBRHKP - Toonville Level 2
YTCHPHKP - Kung Fu Land Level 1
ZTDHPHKP - Kung Fu Land Level 2
DXVGRGKP - Kung Fu Land Level 3
GYVYRHKP - Rezopolis