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If you enjoy large Sudoku puzzles then you'll love this book. Printed at full A4 size, and featuring 50 carefully crafted 16x16 Sudoku, each puzzle has full 8-way symmetry and a guaranteed sensible logical solution. You can complete all of these Sudoku 16x16 simply by scanning the rows, columns and 4x4 boxes, without any requirement to write thousands of tiny pencil marks into the grid. Visit www.SudokuXtra.com for more details.