Thanks for your reply, Tom! I also thought there were way too many triggers, but I couldn't make it work otherwise. I followed your instructions, but now I'm only able to click on 1 of the stars because of the "prevent user from clicking on other layers."
My issue was that I want learners to click on each star to read/hear the layer AND not be able to click on any others until each one is finished. And also have the Next button stay hidden until all 6 stars are viewed. I've attached a new version of the slide using your suggestions. I appreciate any advice you have!