extremely hard sudoku Example: Consider the following Sudoku puzzle: +-------+-------+-------+ | 5 | 6 7 | 8 9 | | 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 | | 3 4 5 | 6 7 8 | 9 1 2 | +-------+-------+-------+ In this puzzle, we can identify an X-Wing pattern for the number 2 in columns 2 and 8.
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extremely hard sudoku There are several difficulty levels in Sudoku, ranging from easy for beginners to expert for seasoned players. Solving techniques include scanning, cross-hatching, and identifying candidate numbers. schweres 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.
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