Start a two player game. Now, beat up Zitz until all of his lives are gone. When you're given the chance to continue, don't. Now play the game normally as Rash, and when you get a game over as him, press start on controller two, so you'll play as Zitz. Again, when you're defeated as him, press start on controller one and you'll resume play as Rash. By repeating this, you'll have more than three continues in a solo game.