Locking navigation until all slides are viewed?

Hi - I'm new to Articulate. I've figured out how to lock navigation but I want to know is there a way to lock the navigation until all slides are viewed? I'm building a course that we want them to review at least once from start to finish but then before they are tested on the material, they can go back and review any slide they want in any order or at any time... is there a way to do this or would I need to make two courses, one with free navigation and one locked and maybe only give them the free version after they've reviewed the locked version?

Thanks!

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