How to Play Sudoku: Rules and Your First Solve
The rules of sudoku in one sentence, the words you need to know, and a simple method to finish your first puzzle. No math required.
Sudoku Blog
Techniques explained one at a time, each with a lesson you can practice in the Technique Journey.
Naked Singles and Hidden Singles, Step by Step
The two techniques that solve most easy and medium sudokus. What each one is, how to spot it fast, and where to practice.
Naked Pairs, Triples and Quads Explained
When two cells share the same two candidates, those digits are taken. How naked pairs, triples and quads work, and how to spot them.