Medium Sudoku
Fewer clues, a little more thinking — the everyday level.
Where notes start to matter
Medium puzzles hand you fewer starting numbers, so pure scanning runs out before the grid does. This is where pencil notes earn their keep: when a cell could take two or three digits, jot them small, then cross them off as you fill neighbouring cells until one answer survives.
You'll lean on a couple of ideas beyond "only one spot left." Watch for a number that can only sit in one row of a box — that often eliminates it elsewhere. Look for pairs of cells that share the same two candidates; nothing else in that unit can be either digit.
Turn on Notes, fill what you're sure of first, and let the pencil marks do the remembering. Still learning the moves? Start with the basics, then come back here to practise.