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world's toughest sudoku Cross Out Possibilities: Eliminate numbers that cannot possibly go in a particular cell to narrow down your options. Each puzzle is a 9x9 grid, divided into nine 3x3 subgrids called "boxes." The objective is to fill the grid with numbers so that each row, each column, and each box contains all of the digits from 1 to 9. ny times sudoku hard Step 7: Solve from the Center The center 3x3 region is often the best place to start solving a Sudoku puzzle. what is x wing in sudoku
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