Sudoku is a logic-based combinatorial number-placement puzzle. The objective is to fill a \( 9 \times 9 \) grid with digits 1 to 9 such that each column, row and \( 3 \times 3 \) box contains all the digits from 1 to 9.

If a Sudoku puzzle is filled correctly, what is the sum of all of the entries in the \( 9 \times 9 \) grid?

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