Pause, hold R1, and enter any of these codes
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, circle, up, up, down, right, right
Invincibility - X, square, down, down, up, down, right
Cemetery - SVZFKHGP, BXRFYHGP, ZVTCYHGP
Jungle - KXVKRHKP, CVHCSHKP, SVKLPHKP, CVBLPHKP
Toonville - RVTCSHGP, XVVBRHKP
Kung Fu Land - YTCHPHKP, ZTDHPHKP, DXVGRHKP
Rezopolis - GYVYRHKP
All Levels Complete - PZYPRXYL
Long ending - During game, pause, hold R1, and press circle, right, right, down, triangle, down, circle, right, right, down, triangle, down, start.
The extended ending of the game will be displayed.
The scenes include sketches and graphics that were used during the game's development.
This is the ending is normally seen only after the Planet X level has been completed.