Jimmy White's 2: Cueball Codes -

Cheat mode:
Enter the snooker room and use explore mode to look at the stool. This should take you into a mouse hole. Look around to see the "Cheat Mode Activated" message. You can now play against all characters.

Hint: Defeating Jimmy:
Just before Jimmy takes a shot, change the shot speed to the lowest setting and he will miss, giving you control of the game.