The Big Book of Sudoku Volume 1

You don’t need to be a math expert to enjoy sudoku – all you need is a logical mind, so sharpen your pencils and brace your brain for the collection of sudoku puzzles. There are more than 540 puzzles ranging over four level of difficulty, from Warm-Up, Challenging, and Tough to the pinnacle Samurai Sudoku – a feast for sudoku addicts everywhere!