Observer killer sudoku
Normal Sudoku rules apply, except the numbers in the cells contained within grey lines add up to the figures in the corner Read more
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Normal Sudoku rules apply, except the numbers in the cells contained within grey lines add up to the figures in the corner Read more
Normal Sudoku rules apply, except the numbers in the cells contained within grey lines add up to the figures in the corner Read more
Fill the grid so that every row, every column and every 3x3 box contains the numbers 1 to 9 Read more