Instruct: Classify a given review into positive or negative sentiment.
Query: Good for 7-11 year olds xD

I got this when I was 10 (I'm 11 now) and it's a really good book. It's a fairly good challenge, too. I would recommend it for (smart) 7-11 year olds. Not TOO childish, but slightly cheesy. I'm glad I got it though.