"Top Dollar" is a very straightforward machine because it has the "single pay line". Sometimes simplicity is the best. I really like the symbol which triggers the bonus round being on the 3rd reel. Traditionally, when there were no potential winning combinations on the first two reeels, the 3rd reel would be anti-climactic. By triggering the bonus off the 3rd wheel, it keeps your attention for the entire spin.
The "Top Dollar" machines were designed as part of the synergy between IGT and the UK's "Barcrest" hooking up. They specialize in the "Fruit Machines" which are so common in England. Essentially, they use backlit plastic displays for most of their games.
I used to play their PINBALL slot when it first came out about 5 years ago.
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