Often a mechanic hints at more than one potential theme, and some thought needs to be applied as to which will be most suitable. In the best instances, a good theme goes on to inform further refinements of the game mechanic. In some cases a theme is temporarily attached to a design […] before another theme subsequently emerges. […] Thus a design informs the theme and vice versa.
Quotes by Kevin Jacklin
There is a danger in taking an idea too far and stretching it ever-thin; movie sequels abound, and some mass-market game titles are constantly being repackaged. But with care, a game publisher can make it easier to gain public acceptance by producing a series of thematically linked game titles.