Sudoku medium difficulty help - Puzzling Stack Exchange

I keep getting stuck on the NY Times Sudoku medium difficulty puzzles. I go through one number at a time and narrow down large box where that number can only be in two spaces. When I finish the nin

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Frequency of Teaching in the Tracked vs. Untracked Treatments (Sudoku)

Free and printable Sudoku puzzles for young and old to challenge and develop your logic and thinking skills.

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How do they make Sudoku 'easy', 'medium', or 'hard'? Is it not just how many squares are revealed? - Quora

MEDIUM Level Sudoku Puzzles 60 KDP 6 X 9 Graphic by Seven Elephant · Creative Fabrica

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An analysis of Harmony Search for solving Sudoku puzzles - ScienceDirect

How do they make Sudoku 'easy', 'medium', or 'hard'? Is it not just how many squares are revealed? - Quora