Numbers outside the grid show the sum of the first three digits in the row or column. Fill the grid according to standard Sudoku rules.
Frame Sudoku is a variant of Sudoku where numbers outside the grid show the sum of the first three digits in the corresponding row or column. Fill the grid according to standard Sudoku rules: each row, column, and 3x3 box must contain the digits 1-9 without repetition. The puzzle is solved when all cells are filled correctly and all sum constraints are satisfied.
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