Immerse yourself in the simple elegance of classic sudoku. In this book, prolific sudoku creator Frank Longo provides 100 classic sudoku, all from easy to medium difficulty, in three different sizes. Most of the book features standard 9x9 puzzles, but any time you'd like to spend a little more time in the world of sudoku, try one of the extra-large 10x10 or 12x12 puzzles! The difficulty levels are the same, but the expanded grids provide a refreshingly different feel.