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when was sudoku invented Eliminate Possibilities: When you come across a number that can only be placed in one specific cell, mark all other cells in that row, column, and box with an "X" to indicate that the number cannot be placed there. w wing sudoku Step 5: Look for Hidden Pairs and Quadruples Hidden pairs and quadruples are similar to naked pairs and triples but occur in a more complex manner. Use the process of elimination: When you have a limited number of possible options for a cell, eliminate the numbers that cannot fit. brainbashers sudoku
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