In 1P mode, you have to fight all of the characters in the game (including the one you are using) and Master Hand. You also play some mini-games along the way. In this mode, you can unlock characters and stages by doing certain things. It does not work like that with Master Hand, though. With Master Hand, you have to hit him again and again until he dies. You do not have to knock him off the stage. It's impossible to knock him off the stage.