I found most of those puzzles to be moderately difficult, not requiring too many notes. Again, the cells are too small, and crazy small in the Killer sub-puzzle included in each of them.
The last puzzles on pages 96-101, named Clueless Loco, are actually 9 puzzles with an embedded 10th puzzle, described at the beginning of the book. Those have the least amount of room in the cells, and usually require the most notes/possibilities. Regarding the puzzles starting on page 91 where the cells are very small, I didn't even attempt the Killer sub-puzzles. I would suggest having just 3 difficulty levels rather than 5, possibly: Easy, Hard, and Extreme. The other is puzzle 46, rated Thinker, where I found the "Greater/Less" piece to be very difficult, although I did solve it. Those would be puzzle 29, rated Cool, which I found to be very hard. Conversely, I found a couple of puzzles that were significantly more difficult than the rating. On two of the above puzzles, 24 and 34, I solved them without having to place ANY notes in the cells, which is rare for me even on easy puzzles. I consider a puzzle to be easy when it can be solved using basic principles of Sudoku, without having to write a whole lot of possibilities/notes in the cells. But I also found quite a few of the puzzles marked IQ to be quite easy. Generally, all the ones marked Easy were indeed easy. I found the ratings on many of the puzzles to be way off.
The puzzles are assigned one of five difficulty levels: Easy, Cool, Thinker, Brain, and IQ. Another reason is if the puzzle is type Killer (my favorite), then that requires dotted boxes inside the puzzle, also taking up more space. One is that if the puzzle is type Frame or type Outside, then that chews up space outside of the puzzle, so the boxes are narrower. There are a few reasons that the puzzles here are smaller. Even with a razor-point pencil and writing as small as I could, I was unable to fit more than 3 numbers in the top of a cell. I take notes in the top of the cells, listing the possibilities. Starting on page 91, the cells are too small. However, I did have some issues with this book: I no longer do the traditional Sudoku puzzles because I find them boring and too easy. I have many of Djape's Sudoku books, and believe that he has the best Sudoku Variation books out there.
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