COKEHEAD: This has probably been answered already but I do not have the patience to go spelunking throughout the dark bowels of the web.
Joe answered your question pretty well, but you do not need to search the web - start with the FAQ and the search button located conveniently to the right on this screen!
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Note - there are two versions of this game - one is the one for PC at wgt.com and the other is a separate APP for mobile devices. They are linked to the same databases but are not one and the same.