I don't agree with the reviewer who thinks that this book can only be read with an adult for a non-reader to solve the puzzles and be interested. My boys are 3 and 5 and have only recently begun to read early reader books like BOB books. So, they are definitely not capable of truly reading these puzzle books by themselves. However, we have read them frequently enough together, and they all follow the same structure, that the boys "read" them by themselves all the time. If they don't always do the specific puzzle on a certain page, they will just search for the things that they tell you to search for throughout the book (like in Puzzle Ocean, one of those things are the blue clams that show up on each double-page spread).All of the books follow the same structure, so it's easy for them to read a new one in the series and understand what they are supposed to do. For example, there is always a "bad guy" who is usually hiding on every double page spread. Then, there are usually two different things that will be consistently found on each double page spread (in Puzzle Ocean, it's blue clams and yellow lobsters). And then, they will give you a list of 10-12 items on the first page of the book, and you need to search for the items throughout the book (one on each double-page spread once again). All of this of course is done within the context of the plot. Each double-page spread has some sort of puzzle. It could be a maze, or a "find what is different" between the left and right page. There is also always a money/counting puzzle (i.e., the girl wants to buy a snack and a drink, and has 10 puzzle pennies to spend, what should she buy?).We read these books a lot, and in many different settings. They like to sit on the couch and we will read them together. Or, we will bring them in the car, and they will read them as we go somewhere. Or I'll bring some to my 5yo's t-ball practice to keep the 3yo entertained. We have had the books for quite awhile and they are consistently read by both boys and they have not bored of them. We have five in the series (Puzzle Ocean, Puzzle Pyramid, Puzzle Mountain, Puzzle Jungle and Puzzle Planet), and they like all of them. Although, I'd say that Ocean and Pyramid might top out as favorites, but it's close. They want Puzzle Dungeon and Puzzle Castle next. I also enjoy the fact that the boys like to sit down together and read them as a pair. It's nice to see them sitting and doing that together.For the price, these are definitely a worthwhile purchase. Ours have also held up very well even though we've traveled with them a lot and they are read on soccer fields and random other places.