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Pigeonhole Principle: If there are only two possible numbers left in a row, column, or subgrid, one of them must go in a specific cell. sudoku boston globe Since a number can only appear once in each row, column, and region, if you find two or three of the same number, the fourth must be in a different row, column, or region. printable sudoku medium levelsudoku cross With its innovative features, endless levels, and daily puzzles, it's poised to become a favorite among puzzle enthusiasts everywhere.
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