Border Sum Sudoku

A standard Sudoku, except that the numbers outside the grid are the sum of the first three digits placed closest to that edge of that row or column. As with other Sudoku variants, this additional rule creates a slightly different solving experience.

Instructions


Place a digit from 1-9 in each empty cell so that each row, each column and each 3x3 block contains all the digits from 1-9. In addition, numbers outside the grid are the sum of the first three digits placed closest to that edge of that row or column.

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