Hold B + A and press Start at the title screen to display the sound test screen to hear the game's sound effects and music.
Successfully complete the game and start another game.
The new game will feature the same amount of lives at the end of the last game and more difficult opponents.
Press Down(2), Up(2), Right, Left, Right, Left, A + B before the demonstration begins at the title screen.
Thirty Lives Per Continue
Press Up(2), Down(2), Left, Right, Left, Right, B, A before the demonstration begins at the title screen.
Then, press Start to begin the game in single player mode or Select + Start to begin in two player mode.
Begin game play in two player mode. Press A + B when losing a life to use a life from the other player.