1. Fill the grid so that the numbers 1 through 9 appear in each row.
2. Fill the grid so that the numbers 1 through 9 appear in each column.
3. Fill the grid so that the numbers 1 through 9 appear in each 3x3 box.
4. A complete Sudoku puzzle contains the numbers 1 through 9 in every row, column, and 3x3 box.
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Daily Sudoku
The puzzle is most frequently a 9×9 grid made up of 3×3 subgrids (called "regions"). Some cells already contain numbers, 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. 
