Topic Icons visited
I'm creating a course that allows learners to choose which topic they would like to learn about by having 2 topic icons listed on a slide. Once they click the icon, it takes them into a section about that specific topic. Once the learner is done, it takes them back to the topic icon slide.
I would like to have the icon (which is a picture, not a shape) be greyed out once that subject has been covered. I also would like to create a trigger to know when both topics have been covered and have a closing "congratulations you've completed both" slide to appear at the end.