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very hard sudoku puzzles 9x9 Here's how you can access and enjoy these puzzles: Online Sudoku Generators: There are numerous online tools available that generate Sudoku puzzles of varying difficulty levels. Unique Rectangle Technique The Unique Rectangle technique involves identifying a situation where a number can only be placed in two cells in a rectangle, and these cells are the only ones in their respective rows and columns. is sudoku good for brain
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