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

Mathematician claims breakthrough in Sudoku puzzle

Solving Sudoku with MATLAB - MATLAB & Simulink

[Robbins, Rebecca] on . *FREE* shipping on qualifying offers. Sudoku: 400+ Sudoku Puzzles with Easy, Medium, Hard, and Very Hard

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Vintage Sudoku – Pigment

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Puzzled?: How to print out crosswords and other puzzles from The Roanoke Times e-edition

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

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Magic, Latin, and Sudoku Squares - Math Teachers' Circles

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