Medium Sudoku is slightly more challenging than easy and is the level most players settle into. Singles will carry you through the opening, but sooner or later you will need pencil marks: naked pairs, hidden pairs and pointing pairs unlock the cells that plain scanning cannot. A typical medium grid takes ten to twenty minutes and rewards a steady, methodical pace.
Rated 2.0–2.9 by Sudoku Explainer, medium puzzles are the default when you open Sudoku69 without a saved game. Brush up on the core techniques in our Sudoku rules and techniques article, or step up to hard Sudoku when pairs start to feel routine.