# Sudoku

Algebra Level 1

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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