The tube patterns on the upper areas are that a ball in the left tube, and especially
the right tube, is bounced back up through the same tube 20% (left tube) to 40% 
(right tube) of the time. Always move the light out of that tube when the ball goes
down through it. When a ball is shot back into the entry area by the right catch ramp,
it always places the ball into the left entry tube. Always move a dark spot to that 
tube to insure weapons upgrades.