Fill the grid so that every row, every column and every 3x3 box contains the numbers 1 to 9.
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Sudoku 2,913 hard
This article appeared in the Guardian on . It was published on the Guardian website at .Last 24 hours
1.
Burger King launches black burger in Japan – and no, it's not just burnt
12 Sep 2014: Sudoku 2,914 hard
10 Sep 2014: Sudoku 2,912 medium
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