I like the Pinball 2000 image reflection effect to add virtual targets to shoot. I think one of the Ghostbusters versions might have a miniaturized similar effect. Strangely I also like a game that's score can be rolled back to zero. And finally, I like the chimes ringing as the end of ball bonus is awarded (e.g., in my Mata Hari).
-Rob
-visit http://www.kahr.us to get my daughterboard that helps fix WPC pinball resets or my replacement LED displays for model H and model S Skee Ball