Fill the grid so that every column, every row and every 3x3 box contains the digits 1 to 9.
Play interactive Su Doku here.
Tips and computer programme at www.sudoku.com
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HOW TO PLAY KILLER SU DOKU
Fill the grid so that every column, every row and every 3x3 box contains the digits 1 to 9.
The digits within the cells joined by dotted lines add up to the printed top left-hand figure.
Within each dotted-line “shape”, a digit CANNOT be repeated.
Top tip: start with the smallest totals.