Help changing state

I'm trying to change the state of the circle for Then vs. Now once the entire scene has been visited. I've tried every single way I can think of to make it work and I can't seem to make it work. I've tried overlaying a button, but it still doesn't work. It must be something with the way I've created the variables? I'm attaching an abbreviated version of the class for assistance. 

Thank you!

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