Lesson 12 Sudoku The "Outside the puzzle technique"

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This "outside the puzzle technique " is one of the most important procedures needed to go on to more difficult puzzles. Whenever you have 3 or more empty cells in a row, column or block use this technique. If you wish to use your memory, and not put the numbers outside the puzzle, you are welcome to do so. Warning, it may be a challenge as you go to harder puzzles.

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