EXTREME Sudoku Puzzles - How to Solve
Here's how to solve an EXTREME Sudoku puzzle from the Dell Totally Top Choice Sudoku book. This one is a moderately difficult puzzle from the medium section which must contain digits one thru nine on both diagonals. Some books refer to these puzzles as X-factor or X-treme. Have fun with it.
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Tutorial #56. A difficult puzzle solved from beginning to end. Lots to learn.
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