Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Probably Excellent

I've come a long way in Sudoku since purchasing this book, mainly thanks to doing the New York Times Sudoku puzzles, Easy, Medium, and Hard. If I purchased this book today, I would probably give it five stars. As it is, I like the puzzles inside this book, but I find the easy ones hard, and so on, up the scale. This makes me wonder if Shortz employed a different rating system (i.e., NYT Easy aren't even here, and the Easy in this book start at the NYT Hard level?) for this book than for the puzzles in the New York Times. Difficult, a challenge, but worth the effort . . . and one day I'm going to finish every last puzzle in this book!