As the title suggests, there is a lot of gas and smells discussed in the book. Just the right topics for boys aged 9+ - and the fits of laughter that I heard while he read the book proved that this is just right for him.
The writing style is great for this age range. It is written as a story, rather than a diary but it has a nice style which can be picked up easily and a quick chapter read. The story is accompanied by some fantastic cartoon style illustrations which add more humour to the book.
I would recommend this book to anyone who loves horrid Henry and diary of a wimpy kid.