I purchased a new sudoku puzzle book, Second-Degree Black Belt Sudoku (by Frank Longo) from a big-box book seller. Why? Possibly I'm worried that my favorite sudoku puzzle book (New York Post series by Wayne Gould) was nearly full. The good news is that Second-Degree Black Belt Sudoku has:
- more difficult puzzles compared to the New York Post series by Wayne Gould
- more puzzles; 300 versus 150
The bad news about Second-Degree Black Belt Sudoku is that:
- paper quality is not compatible with using an eraser
- top and bottom margins are smaller leaving less room for margin notes
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