Automated Changes Once A Slide Has Been Viewed

[MParson8297]

I have a master PowerPoint slide, (slide 1), with 25 links to other PowerPoint slides. Once I select a link and view the slide that link is associated with, I want to be able to go back to that home slide with some type of indication automatically in place to indicate that first link has already been selected. It can be faded out, color changed, blank, etc. but I need some type of indication on the home slide as each link is accepted. Right now I have square objects organized on the home slide with hyperlinks to individual slides but I need a better way because there will not be any specific order in which the individual 25 links are selected. Any ideas how to accomplish that?