Type xyzzy, press [Keypad Enter] and [Left Shift] as soon as the game
loads. Moving your pointer over a square with a hidden mine will result
in a very small black pixel appearing in the top right corner of the
screen. Alternatively, type [Shift][Shift]xyzzy[Shift][Shift] after
moving the pointer over the game area.
Hold the Left Mouse Button + Right Mouse Button and press [Esc].
Note: This procedure involves editing a game file; create a backup copy
of the file before proceeding. Use a text editor to edit the
"winmine.ini" file. Add the line "SOUND=3".