Back again for fans of these giant puzzles, this twelfth book of 25x25 Sudoku puzzles brings you 50 more enormous challenges. Printed in large page format on top-quality paper, each puzzle is attractively presented in a range of symmetric patterns. Every sudoku in the book is guaranteed to be human-solvable - you can complete all of the puzzles just by scanning rows, columns and boxes, without having to make any pencil mark notes. Visit www.SudokuXtra.com for more books in the series.