
While this puzzle book might appeal to hardcore sudoku enthusiasts seeking a serious challenge, the inaccurate difficulty labeling is a significant issue that undermines the entire product. If you're a beginner or intermediate solver looking for puzzles that match their advertised difficulty, we'd recommend looking for another sudoku book with more reliable categorization. However, if you specifically want challenging puzzles and don't mind ignoring the difficulty labels, this could deliver what you're looking for—just go in with the expectation that everything will be harder than stated.
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