Notice the other two reviews (as of this writing) are from people who gave the book as a gift, not people who play sudoku. I do the puzzles, and rate the book two stars because they are not "super fiendish" and in fact are pretty easy.
They do NOT require any special techniques to solve, such as Swordfish or X-Wing etc. Just basic logic.
That said, they are not trivial. You'll need to make notes in many of the squares to indicate possible positions, and be familiar with some of the basic logical techniques (such as matching pairs of numbers to eliminate those numbers elsewhere in a given row/column/box.)
I'm an intermediate-level player and these take me about 10 minutes each to solve.
These are somewhat easier than Frank Longo's difficulty level 2, if you've tried any of his (excellent) books. His level 3 and 4 books are much, much more difficult than the puzzles in this book.
REGARDING FORMAT: There is only one puzzle per page, which is great -- so you have enough room to write small notations in the squares. However it's not a large book, and the margins around the puzzles are pretty wide, making the puzzles smaller than would be ideal -- not as large as some of those that I've played on spiral-bound books, but big enough. Being a paperback, it doesn't open up as nicely as a spiral book, and the paper is newsprint quality rather than the nicer, whiter typing-paper quality found on some other sudoku books.
If you are a beginner looking for something a bit more challenging, then this could be a good next step for you. However the Frank Longo Level 2 Absolutely Nasty Sudoku Level 2book would be a much better choice, because it's inexpensive, spiral bound, has larger puzzles, and is printed on large high-quality white pages.
I give this book the two-star rating because the title is VERY misleading, and the paper size/quality is relatively poor.
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