Medium — subsets & intersections
Medium Sudoku #20
A hand-graded medium puzzle — 27 clues, roughly 6 minutes. Every puzzle here has exactly one solution, reachable by logic alone.
●Medium
Solved. Nicely done — want another?
What this puzzle needs
Solving this one by logic calls on 3 techniques, from the everyday to the demanding. Each links to a full guide:
One thing to look for
The turning point is a Naked pair — In box 5, r4c5, r6c5 share only {7, 9} — those digits can be removed from the rest of the box.
Stuck? Let it teach you
Tap Hint once and the solver names the next logical move and the region it lives in — "hidden single in box 4", say. Tap it again to make the move. Nothing here ever needs a guess. Prefer to see the whole solution? Drop this grid into the step-by-step solver.