Start later in a two-player game
A variation of the continue later code for two player games in Nintendo power I discovered myself. Rather simple.... Start a 1-player game and proceed to whatever level you wish. When you get to the level your friend wants to start in (you could go to level 9 and play that when your inexperienced friend couldn't make it there, for example) You will then start with all continues/lives and start on the level 1P is currently on.