
This article is from the General Pinball FAQ, by Keith Johnson keefer@access.digex.net with numerous contributions by others.
That is the sound of a solenoid banging the side of the pinball cabinet.
Well, not always the side of the cabinet, but usually. Some newer Williams/
Bally games have the thwacker (technical term) in the backbox. Weird. In
most cases, it signals the award of a free game, a chance to play the machine
again at no cost! Along with being a real-life physical entity that you can
manipulate, free games are what sets pinball machines apart from video games.
There *is* the occasional video game that gives free games (like Mr. Do), but
they are few and far between. A more recent example is Cruisin' USA (for
getting first place), but I don't consider that to be the same thing because
you are still continuing where you left off.
 
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