This is a book of 200 Giant 16 x 16 Sudoku puzzles. These puzzles work in exactly the same way as traditional Sudoku puzzles, but a bit bigger to offer a bit more challenge. Each row, column and region must contain the numbers 1-9, but they must also contain one each of the letters A, B, C, D, E, F and G. You can still use exactly the same techniques to solve these puzzles, but they will take you a little longer There are 200 puzzles altogether, split up as follows. 50 Easy puzzles. Ideal to get started. 50 Medium puzzles. For you to move on to once you start feeling more confident. 50 Hard puzzles. Getting harder 50 Tough puzzles. For the diehard Sudoku fans. Something for everyone "