Complete cadet with the science mission. Just as the mission lights are flashing, 
drain the ball as quickly as you can. If you do not want to lose a ball, make 
sure have an extra ball or replay. After the ball returns to the plunger, you 
will be on the next level with full mission lights. Now you only need complete 
one mission for each level. Make sure you get an extra ball or replay before 
repeating this trick otherwise you will not make it very far.