How to approach this level
Start with rows and boxes that contain several givens. Add candidate notes where scanning alone has not narrowed the choices.
Use arrow keys to move one cell, Home and End to move within a row, digits 1 through 9 to enter a value, N or Space to toggle notes, hold Shift to temporarily reverse the input mode, H to request a hint, Shift plus H to apply an explained step, and Escape to pause.
Game paused
Puzzle complete
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About medium Sudoku
Regular players who can find singles and want a balanced logic workout.
When a placement is forced, rescan the intersecting row and column before adding more notes. For a stubborn box, test one missing digit against the two crossing units.
Use hints as instruction
Select Explain to preview one supported step. Read the candidates and reason before choosing Apply step.
What to learn next
Study candidate notes and hidden singles to make each placement explainable.
Learn candidate notesPrefer paper?
Print four certified medium puzzles with a separate answer key.
Open the medium printable sheet