Here are some cheats and tips for the game Ninja Gaiden 2: The Dark Sword Of Chaos.
Sound tests:
Hold Up/Left + Select + A + B
and press Start at the title screen to display Ryu and
allow all music from the game to be played.
Alternatively, press Start after the title screen fades
to display it again. Press Up/Left + A + B
+Start to display Irene Lew and allow all music from the
game to be played.
Finally, press Start after the title screen fades to display
it again. Allow the screen to fade again and press Start.
Press Up/Left + A + B +Start to display
Ryu and Irene Lew and allow all music from the game to be played
with a volume and song title display.