Reveal mine:
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. Alternately, type [Shift][Shift]xyzzy[Shift][Shift] after moving the pointer over the game area. Note: This code does not work in the Windows Millennium Edition version of the game.
Unlimited time:
Hold the Left Mouse Button + Right Mouse Button and press [Esc]. Alternately, hold the Left Mouse Button + Right Mouse Button + [Ctrl].
Sound effects:
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".
Change best times:
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. Change the lines labeled "Name1", "Name2", and "Name3". Just change the name after the "=" sign, with the name you wish to have appear on the best times list. Also, if you wish to edit the times which appear on the list, edit the lines "Time1", "Time2", and "Time3", to the number of seconds.