Back again for a twelfth volume thanks to continuing demand, Sudoku 16x16 Volume 12 contains 50 more attractively-designed large 16x16 Sudoku puzzles. Every puzzle can be solved just by observation - you don't need to make any pencilmark notes in the grid if you don't want to. At this size of puzzle that's really important Just place 1 to 9 and A to G into each of the rows, columns and 4x4 boxes. Visit www.sudokuxtra.com for more books in the series.

Returning for a thirteenth volume thanks to continuing demand, Sudoku 16x16 Volume 13 contains 50 more attractively-designed large 16x16 Sudoku puzzles. Every puzzle can be solved just by observation - you don't need to make any pencilmark notes in the grid if you don't want to. At this size of puzzle that's really important Just place 1 to 9 and A to G into each of the rows, columns and 4x4 boxes. Visit www.sudokuxtra.com for more books in the series.

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.

Returning for another volume thanks to continuing demand, this thirteenth book of giant Sudoku puzzles brings you 50 more enormous 25x25 Sudoku puzzles. 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.