On Scared Stiff, on what basis is the ball, on left lane shots, allowed to pass through to the pop bumpers?
What is the rule for awarding extra ball on this-and-this bonus-x reached?
I cannot find any documentation of this in neither the manual, rulesheets or game adjustment menu. Other than it might be one of the ways for the game to meet a desired extra ball percentage. I have experienced this for both 4x and 9x (not same machine and hence not necessary same setting).