At the game over screen with controller 2 hold L + R + Select until the title screen appears. Then go to the options screen and set the credits to 30.
The fighting's easy with this password that enables you to play as any of the bosses or enemies. Just enter the password "9207."
- Hold X + Y on controller 2 and reset the game. Release the buttons at the title screen: 5 Round Match in vs. Mode
- Hold L + R + UP on controller 2 and reset the game: Double the life
- Hold A + B on controller 2 and reset the game: One Round Match in vs. Mode
- Hold A + B+ L + R on controller 2 and reset the game: Super Difficulty
