Sudoku 129 |top| Now

Because each row, column, and 3x3 block contains numbers 1-9 exactly once, the sum of all digits must be 45 (

Focus on a single number, like 9, and look at all the 3x3 boxes. By scanning horizontally and vertically along the rows and columns that already contain a 9, you can rule out empty cells in adjacent boxes until only one possible spot remains. 2. Counting 1 to 9 sudoku 129

There is a fascinating mathematical footnote in Sudoku history involving the numbers 3, 4, and 129. Because each row, column, and 3x3 block contains

A: No. A valid Sudoku puzzle has exactly one solution. If yours has more, check the given numbers – you may have mis-copied. Counting 1 to 9 There is a fascinating

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