Back for a sixth volume of giant puzzles due to popular demand, Sudoku 16x16 Volume 7 contains 50 more attractively-designed large 16x16 Sudoku puzzles. Every puzzle can be solved just by observation - no fiddly pencilmark notes are required. Just place 1 to 9 and A to G into each of the rows, columns and 4x4 boxes. Visit www.SudokuXtra.com for more details.