Been playing my BTTF Pin (never played this game before) and I had a question about the "special when lit" feature. I notice after I keep hitting the green DOC targets on the right, the bonus multiplier increases. It eventually gets to the RED 6X LITE SPECIAL...
However, I am not sure what to do or what happens next. I assumed the left and/or right drain line SPECIAL WHEN LIT would light up and I would get something special, but the drain line inserts don't come on (and yes, they have working bulbs).
What am I missing? Maybe they don't have anything to do with each other but if that's the case, when DO the drain line SPECIALS come on?