Storyline Player and Restricted Menu Access

How do you go about creating 'restricted' menu access for 5 individual scenes in 1 project.  Meaning, student may attempt scene 1, 3 & 5 without completing scene 2 & 4.   However, I still wish for each scene's menu to be restricted.   Student will be e- rewarded for completing each scene and then also given an e-certificate of completion once all scenes are done.  Any words of wisdom are greatly appreciated.

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