Enter "FLYTO35" as a password, for the Ending Sequence.
Enter "1GOTP1NK8CIDBOOTSON" as a password. A new option on the title screen will allow the display to be changed between NTSC and PAL.
Enter "G0LVl xx," where xx represents the level you want. For example, if you want to go to Level 14, enter "G0LVL14"
Pause the game and press Triangle, Circle(2), Square.