**Categories of printable sudoku
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# Printable Sudoku

**Goal of the printable sudoku N 9**

The sudoku puzzle is mostly a 9-by-9 grid made up of 3-by-3 subgrids. Some cells already contain digits, known as givens. The goal is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1 through 9 exactly once. Each number in the solution therefore occurs only once in each of three "directions". Or you can say there is only one rule. Every row, every column and every 3-by-3 subgrid should contain numbers 1 to 9 only.

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