Results Slide Variables - Course with No Quiz

Hello.  I'm returning to Storyline after a two-year absence and the results slide variables have me baffled.

I have a branching course with a menu for navigation.  The course has no quiz and success is the visitation of each slide. I want to prevent a learner from using the menu to navigate straight to the end of the course and achieve completion.

Any tips on which variables to use on the success and fail layers of the results slide? I've searched the discussions but without luck.

Thanks for your help.