To activate the cheats:
Select a table and start a new game.
Having done that, press ESC and type 'kermit'.
Then, during gameplay, press ESC and type in one of the following codes:
aloadofballs - Player receives 98 balls
extraball - Player gets 1 extra ball
joshuajein - Disable Tilt
kickback - The ball is always knocked back into play
pickupbal - lets the player pick up the ball and move it with the mouse