Get as close to perfect as possible every time
Isolate one ball into a box, then bring the ball down to all but one free square. Aim your pointer so that you go into the square. You will see a permanent red or blue (depending on direction) square. You can now only use the red or blue line. Keep using it slowly and get rid of as much space as possible. You will never win until you have 75 percent completed and have lost all your lives. When you are down to one ball isolated and not completed, bring it down to two lines of space and make it as little as desired. However, make sure you can still hit the ball so that you lose. You will then win and have a lot of points.