Important Qualities of a Rummy App. Your gaming experience can be greatly improved by choosing a rummy app that has a few essential features. Above all, the app's design & user interface games apkgreatly influence how much fun it is to use. An app with good design should be simple enough for users to navigate through menus and game options without getting lost. The gameplay experience, animations, and graphics. In order to create an immersive environment that keeps players interested, the graphics and animations should also be appealing without being overpowering.