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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The Language Lover's Puzzle Book: Lexical perplexities and cracking conundrums from across the globe by Alex Bellos

Number Puzzle - Number Games - Apps on Google Play

An analysis of Harmony Search for solving Sudoku puzzles - ScienceDirect

Spot the Number - Cool Multiplayer Math Game with Leaderboard - Microsoft Apps

Sudoku #1193 and #1194 (Medium) - Free Printable Puzzles

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

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

Medium Difficulty Sudoku Puzzles for Kids - Free Printable Worksheets

Sudoku - Medium

logical deduction - A Sudoku With A Trick - Puzzling Stack Exchange