While in the main menu with the cursor on "Balls", hit (at the
 same time):

 BAL[Enter]

 Result: 13 balls!!!! Nice one.

 When playing a table, hit [PrintScreen] which captures the screen
 in pcx in the extreme directory.

 Hit the [1] key and turn off anti-gravity.
 Hit the [2] key and turn on anti-gravity.
 [F12] changes the scoreboard color.

 While on some tables hit:

 [F1]              changes ball type
 [F9][F10][F11]    different sound effects