Sudoku puzzle

Algebra Level 1

What's the sum of all the numbers filled into a sudoku(数独)puzzle?

NOTE: A sudoku puzzle is a 9x9 grid.

Each line and column needs to be filled with number 1 through 9 without repetition.

There are 9 3x3 squares in the 9x9 grid, each 3x3 square needs to be filled with numbers 1 through 9 without repetition.

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