The book is very small and concentrated around the theme of the game Rolling Sky. The book guides the readers on how to become a good player of this mobile game. However the real treat is towards the end where the author Gamer Loren shares some tricks on how to generate endless gems and also make the game less challenging by making it slower.
For me the challenge of the game is really what makes it interesting. So, I liked the initial guidance part. I only think that the author could have added little bit more info on how to win the game in a natural manner without the cheats and what all obstacles to expect and at what time duration at various levels, then the book would have been unbeatable.