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difficult, hard, great, good and small.
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- This product had a total of 52 reviews as of our last analysis date on Dec 29 2018.
My main criticism of the book is its small size and dense binding
It's overall about a 9 out of 10 on difficulty
I think that a book this small should be spiral bound for ease of use
The publisher has a real ego about its superiority based on owning the trademark on publishing sudoku in japan at least