Have you looked at Pinquest (www.playpinquest.com)? They were set up as a vendor at Expo in 2019; my booth was near theirs. They had example quests set up within Expo - I think one reaching a very low score metric on one particular game and earn a piece of candy at their booth. They had several running simultaneously and some had more substantial rewards for achieving more challenging things on a series of games. Their goal at Expo was to get their name 'out there' and get folks to download their app... guess it was somewhat successful since I remembered it!

Nice folks they were.

-Rob
-visit http://www.kahr.us to get my daughterboard that helps fix WPC pinball resets or my replacement LED display boards for Model H & Model S Skee Ball