Chapter Book: "Down and Out Down Under"

Chapter Book for third to fourth graders. "Down and Out Down Under," by Geronimo Stilton. Illustrations by Silvia Bigolin. I like how the book gives interesting information on different issues, from eye conditions to jet lag, to facts about Australia, to how to survive in the outback. But I didn't like the constant bold and colored lettering of random words like: get on, liked, sliced cheese... I could see if it was for new readers. Or if certain nouns, verbs, or opposite words like out, in, up, or down were in bold. Or if words like black or brown matched their color. But the randomness of the colored words is just lost on the reader in this book. I doubt a child would remember how to spell spectacular just because it was in red.
Now about the main character. His name is Geronimo Stilton. He's a newspaper publisher who happens to be a mouse. Petunia, a TV mouse reporter who Geronimo has a crash on, persuades Geronimo to go on adventure in Australia with her and her brother Wolfie. If you happen to be in the library you might think of picking up this book. But I wouldn't buy it.