2,5/5. Honestly a bit too simple. I like the concept and the purpose of this book, I also like the mathematical concepts introduces with the activities presented, but the activities themselves are a bit too simple, not much educative and just a «fun» thing mildly relate to the concept. If you're looking for something fun and light this might do it, but if you're looking for something truly educative, then I think you better pass on that one.