This book provides an excellent introduction to Sudoku, complete with background, history, and helpful tips. 101 Sudoku puzzles usually involve a 3 x 3 grid of nine 3 x 3 boxes. Some numbers are filled in, many spaces are blank-and your job is to fill in the spaces using the numbers 1 through 9, making sure that all of them appear only once in every column, row, and 3 x 3 box. The puzzle here start off nice and easy, and work they way up gradually into the realm of skull-bending sudoku madness! Includes all the solutions (no peeking!).