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2 stars
The illustrations were great. I liked that unlike traditional "Choose your own adventure" they weren't written in some weird second person perspective (e.g. "you took a step to the right and found a rock") and instead allowed you to make the decision of a particular third person the person of whom changes throughout the book depending on what makes sense for the story.
I found the story itself was kind of lame and I still couldn't get my 12-year-old interested in reading even though she's a huge Gravity Falls fan.