This tune is played after the title screen has been prepared (see 88A8).
In-game tune
This tune is played by the main loop while a game is in progress (see 8B3C).
Title screen screech
This sound effect is produced after the theme tune has finished playing, and
repeats until the 'Press ENTER to Start' message has finished scrolling across
the screen (see 88B1).
Item
This sound effect is produced by the routine at 93D1 when Willy collects an
item.
Arrow
This sound effect is produced when an arrow is fired (see 9237).
Lose a life
This sound effect is produced by the routine at 8C01 when Willy loses a
life.
Game over
This sound effect is produced by the routine at 8C4A during the game over
sequence.
Jumping
These sound effects are produced by the routine at 8DD3 when Willy is
jumping.
Falling
These sound effects are produced when Willy is falling (see 8E6A).
