A "Skip Question" Button and Review Only Skipped Questions

There might be a better way, but I'm sure there's no shorter method given that the question bank holds 100 questions. If you want to keep the NEXT button, I suggest the following tweaks:

1. Set all question slides to "Resume saved state when revisiting" (so Storyline can check if the question has been answered in the first round).
2. Create a trigger on the base layer (see screenshot 1).
3. Add an empty layer (e.g., "answered" layer) and create a trigger to "Jump to the next slide when the timeline starts on this layer" (see screenshot 2).
   
   
   
   Logic: 
   
   If you skip the question in the first round, none of the radio buttons will be in the selected state upon revisiting. If the question was answered, the "answered" layer will be shown upon revisiting based on the conditions in the trigger, and it will immediately skip to the next question until a skipped question with no selection is found.
   
   I've attached a shortened version with 10 questions for you to review and possibly find a better way.

Thanks for that!  I'll give it a try although... I think I may just let them review all questions and not just the ones that they missed.  Seems like less work.