In any level look for a check point. Go over and get it. Then, if you have more than one life, purposely die.
Then, when you're back to life, go backwards from where you came from. You will find out that the robots you destroyed are back from the dead.
Destroy all the robots again and you will get more points than if you didn't do this cheat.
If you still have more lives don't do this again until the next check point, if you do it again then you'll have the same points of when you got the check point.
Added by: stonescape , ID#7404