More likely to be a list other than a game. The list of differences between the books and the TV Show...

All you have to do is write one difference [or more] that you find in the book and not in the TV Show [and vice versa].

We will continue until we have no more ideas, and we how many differences there are...

I will start with number 1:
- Maura, in book, has black short hair while in the TV Show, Maura has longish brown-blonde hair