Using a delay in the Next button/link/image from displaying until all content has been reviewed

I am creating a course that has multiple sections with multiple topics in each section.  For each section, I created a slide that has a clickable menu that takes them to different topics (multiple slides, branched scenarios, etc.).  What I want to happen is, once they view all the topics within that section, a Next button displays to advance them to the next section.

I don't want the Next button that  takes them to the next section to display until they have viewed all of the topics within the section.  I tried using states to hide the Next button until all topic buttons have been selected, but as soon as they click on the last topic button, the Next button displays.  I don't want the Next button to display until they return to the slide with the clickable menu.

I am stumped.  Does anyone have a suggestion on how to accomplish that.