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Su Doku 808 and 809; Killer Su Doku 229

To ensure grids print out on one sheet of paper, place cursor over image, right click for options window, select “print”

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

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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.