Help with true/false variables

I am just now learning how to use variables.  I watched the video but it does not go far enough to answer my question.  I have a module with 5 topics.  There is a slide with 5 buttons to access each topic.  The learner can choose a button and it goes to that scene.  When they finish, a button returns them to the original page to choose another button.  The learner can access any of the first 4 topics in any order, but I need to set it up so that they can not view the 5th topic and complete the module until all 4 of the other topics have been viewed.  How do I set this up?

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