The objective is to fill in the empty cells with numbers from 1 to 9, ensuring that each row, column, and 3x3 subgrid contains all the digits exactly once. brain training sudoku Identifying Unique Rectangles To identify unique rectangles, follow these steps: Examine the Sudoku grid and look for rows, columns, or 3x3 subgrids that contain two or three pairs of numbers. pi day sudoku answers
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