Right, you've looked at all the other cheats and you are fed up of finding them again? I've 
sorted all the cheats that work on XP and Vista and put them here. When the game begins type 
"hidden test" (In lower case) Then you click on the pinball screen and control the ball via 
the mouse. Before the game begins type:

Code    Effect
--------------------------------   
Gmax  - gravity well
Rmax  - advance in rank
Bmax  - unlimited balls
Hmax  - Score of 1,000,000,000
Omax  - Play in red!
1max  - You should get an extra ball when you loose your upcomming ball.

Note: Sometimes you can't go on the high-score board when using these.