Press 2 at the title screen to display the sound test screen. Select a sound or song with the D-pad and press 1 to hear it. Press 2 at the sound test screen to display the level selection screen. Use the D-pad to select a level and press 1 to begin game play.
Collect the extra life in the first group of clouds, and a second extra life at the end of the level. Intentionally lost your current life, and repeat this process to collect an unlimited amount of extra lives.