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leetcode valid sudoku 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. very hard sudoku puzzles 9x9 Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible. gamovation sudoku Playing Sudoku daily has many cognitive benefits, including improving memory, concentration, and logical reasoning skills. It is a great way to keep the brain active and healthy.
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