Medium sudoku removes more starting digits than our easy board, so singles appear less often and you will need candidate tracking in harder boxes.
The grid is still a standard 9×9 with nine 3×3 boxes — only the clue density changes.
How to play Sudoku Medium
- Place digits 1–9 so each row, column, and 3×3 box contains every digit exactly once.
- Given digits cannot be changed.
- New game generates a fresh puzzle. No guessing should be required on a well-formed medium grid — look for the next logical elimination.
Strategy tips
- Mark mentally which digits are still possible in each empty cell within its row, column, and box.
- Hidden singles: if a digit can only sit in one cell inside a row (or column or box), fill it even if the cell has other candidates.
- Naked pairs: two cells in a unit sharing exactly the same two candidates eliminate those digits from other cells in that unit.
- When stuck, pick the box with the fewest empty cells — constrained boxes break open faster.
- If easy sudoku feels slow, medium is the step where technique starts to matter more than scanning.
Common questions
How is medium different from easy on SolitaireFelt?
We remove more givens on medium (46 empty cells versus 36 on easy). The rules are identical; difficulty comes from clue sparsity.
