There is a secret tunnel in the deployment chute.
 To get this the ball into this tunnel called a Skill Shot, you must
 launch the ball partway up the deployment chute and have it come down
 to the first yellow arch light. There are 6 yellow arch lights in the
 chute, and they give out different points depending on how many you
 hit:  
 
 1 - 15,000 Points
 2 - 30,000 Points
 3 - 75,000 Points
 4 - 30,000 Points
 5 - 15,000 Points
 6 - 7,500 Points

Cheat List:
 
Type these codes at the beginning to get their effect

Gravity well: gmax 
Never lose: bmax(but you can't get a recorded high score 
Extra ball: 1max 
Promotion: rmax 
 
Unlimited balls:
Type bmax at the full screen when the game firsts starts up. Note: This will work 
on Windows XP, but not on Windows NT 4.0.
Note: When the above code says "full screen", it does not mean the full screen 
when the game starts up. Press [F4] to enter the full screen game mode and the 
code will work. The extra balls will appear from the yellow wormhole.