
This article is from the General Pinball FAQ, by Keith Johnson keefer@access.digex.net with numerous contributions by others.
Yep, and they usually do quite a few times. One reason is because most of
the rules and timers can be adjusted with the operator menus. (See the later
questions on how games get easier or harder.) The other major reason is
because the rules in general go through several revisions. In order to do
this, though, they have to make new ROMs for the game.
Generally speaking, the later the ROMs the better, because that means they
have the rules refined a bit more and the bugs worked out for the most part.
However, as games get more and more complex, the likeliness of bugs showing
up gets higher and higher. IJ and JP are 2 good examples of games that still
have a large number of bugs in them despite having gone through a large
number of ROM changes.
 
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