Containing standard puzzles and killer puzzles, this new sudoku collection also introduces jigsaw sudoku. This puzzle is exactly the same as a normal Sudoku - fill in the rows and columns and boxes with 1 to 9 without the same number appearing in any row, column or box. BUT, in a jigsaw, the boxes are rather strange shapes. You can still use the same strategies but you may also find you invent some new ones.
Michael Mepham compiles crosswords and sudoku puzzles for the Telegraph.