The Addams Family
If you've only played one pinball machine in your life, chances are it was The Addams Family. Most reports place it as the best-selling pinball game of all time, with around 20,000 units sold. That's huge for the industry, and these machines can still be found in pizza parlors and arcades around the country.
The exact reason for its massive success is hard to nail down, but for the most part it seems it was just that well-designed—the man in charge, Pat Lawlor, went on to design the Twilight Zone table, which was also massively successful.