This is "Welcome to the World Of Sonic" book. It's a book meant to welcome in new fans of the Sonic series, and it comes with a sheet of stickers that you can see here in the back as a bonus.
This book is geared toward kids (of course) but it's ok for any fan, really. It spells out the basics of Sonic with character proflies for lots of characters, but then it also has nice tidy summaries for LOTS of the modern games. They get into the portable ones too, that maybe not everyone was able to beat. It's a good book to catch up on history with. There's nicely used stock art of each character through out. There's also the usual little random/wacky/easy "quizzes" hanging around on some of the pages as well. The characters 'talk' as a mini bio (you can see here with Silver talking about 'the future' in his circle there) This is only about 8 dollars or so on Amazon, so it's worth while to collect it since it has a good amount of nice art, good layouts, tidy summaries, stickers & isn't very costly. It's worth it's while.