How can I protect certain content with a level but leave the rest of the site available?

I am trying to build a site where people are given drip content on a weekly basis. I want the user to be able to access previous week's content, but I don't know for sure how to set all this up properly. The problem is page permissions, as most of my site should be seen by all, but just weekly videos should be limited by what week a person is on. Any suggestions on how this is suppose to work?

I had it sort of working by putting all my pages that everyone had access into a "Week 1 - Level 1" area, and then adding another level called "Week 2- Level 1" and simply including the corresponding video for that week. Once I tried advancing users via the subscription side though it only bumps them up a level, it doesn't add a new level to the existing one(s).