This book contains 101 puzzles, arranged in sections of increasing difficulty: 20 puzzles graded easy, 30 medium, 30 hard and 20 graded very hard. The logic steps required to solve each puzzle are many and varied. With practice, an easy puzzle might be solved in as little as 10 minutes, while a very hard puzzle may occupy even the accomplished Sudoku-er for more than an hour. The solutions of all puzzles are provided in the back of the book.



