Mighty Morphin Power Rangers

Enter this at the title screen

Press B, A, C(2), A, B, A at the "Difficulty/Start" screen. A sound will confirm correct code entry. Press Start during game play after a life gauge appears (combat sequence) to advance to the next level.

At the Difficulty/Start screen, press: B, A, C, C, A, B, A - during the game, just press Start to skip to the next stage.

Press A, B(2), A, C, A, B(2), A at the title screen.