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hard printable sudoku puzzles Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids contain all of the digits from 1 to 9. sum sudoku online Sudoku variants like Killer Sudoku, Jigsaw Sudoku, and Sudoku-X provide additional challenges for players looking for something different from the classic version. mathisfun sudoku To solve a Sudoku puzzle, one must look for cells where only one number is possible, or rows/columns/blocks where a specific number has only one possible placement. nyt hard sudoku answers today Sudoku variants like Killer Sudoku, Jigsaw Sudoku, and Sudoku-X provide additional challenges for players looking for something different from the classic version.
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hard printable sudoku puzzles Example: Consider the following Sudoku grid: +-------+-------+-------+ | 1 2 3 | 4 5 6 | 7 8 9 | | 4 5 6 | 7 8 9 | 1 2 3 | | 7 8 9 | 1 2 3 | 4 5 6 | +-------+-------+-------+ | 2 3 4 | 5 6 7 | 8 9 1 | | 5 6 7 | 8 9 1 | 2 3 4 | | 8 9 1 | 2 3 4 | 5 6 7 | +-------+-------+-------+ In this grid, we can apply the XYZ-Wing strategy to eliminate the number 2 from the first row, first column, and first box. sudoku terms These are known as "locked candidates." Fill in these cells, and then move on to the next step. when was sudoku invented Look for any cells that have more than one number or any rows, columns, or 3x3 grids that have duplicate numbers.
