Press Ctrl + A at the main menu to gain access to both the ability to edit the Hall of Fame, and many gameplay options, such as editing the upper and lower limits of numbers as the stages progress, or locking access to game types in the main menu.
Set the system date to December 25 to place a SantaClaus hat on the Muncher.
When Toggles are moving directly towards you, movewhile the Toggles are between two squares to walk through them.
If the date on your Apple II is December 25 (Christmas), the Muncher will wear a Santa Claus hat.