Quick Question about how to make a button appear after all slides have been visited

I have a question about a practice course I've been working on. I am really new to Storyline 360, but I have figured out a lot with trial and error and mostly by reading on this site and watching videos! I have this "home" screen where there are 3 buttons to learn more about plants that need full sun, partial shade, and full shade. I want a "next" button to appear AFTER they have visited all the examples under each button. (I'm attaching a screenshot.) It will take them to an illustrated garden I drew myself of 14 native plants to explore. I don't want them to go to this page until they've visited the previous ones. My problem is I don't know how to make the button appear after they've visited everything. I know it's possible because I have seen the "if" statements/conditions you can add. I know you experts could do this in two seconds, but I am so new to this, I am at a loss. Thanks for any help!