Level Unlock System
Hello, I am working on my first 2d Unity game.
It is a simple game where you can browse through different folders.

From here, I want to have a system where player have to enter '08 summer folder first to enter '09 summer folder. So I want to have some kind of a level unlock system where they have to visit '08 summer folder to unlock '09 summer folder.
I am wondering what I have to do to make that possible...
Also is there a way to display text saying "I don't want to browse this folder yet" when players try to browse '09 summer folder before unlocking it (before browsing '08 summer folder)?
Thank You
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