Rules: Place a digit from 1-9 into each cell such that every digit appears in every row, column, thickly outlined 3x3 region, and orthogonally connected gray region.
#17: Extra-Regions Sudoku
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Rules: Place a digit from 1-9 into each cell such that every digit appears in every row, column, thickly outlined 3x3 region, and orthogonally connected gray region.
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