Killer Sudoku is a variant of the traditional Sudoku puzzle that adds an additional layer of complexity by introducing "cages." In a Killer Sudoku, the standard Sudoku rules still apply: the goal is to fill a grid (typically 9x9) with digits from 1 to 9 such that each row, column, and 3x3 subgrid contains each digit exactly once. The unique feature of Killer Sudoku is the presence of these cages, which are outlined by dotted or heavy lines.
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