The steps to freedom....

Thinking too hard and reaching here but hey...

I kinda thought the second one was a scope

How is this "mindblown"? It's a really obvious evolution.

I read another book (series) which had covers just like that although it was an actual girl inside a glass ball you can see the similarities if you search up the book covers. The series is called 'Matched'

We have different covers here in the UK...

I thought of it like an arena. In the first and second one she is in the games (so in the arena) while she isn't in the third.

there are different covers in Australia too

Or the rings could be the times shes in the arena and in the third one she isnt.

But the third book's color looks like snow

(Reference to title) so in other-words: the steps to America