Fair Sudoku

Sudoku that never makes you guess. And no ads — ever.
The contract — Every puzzle is certified: solvable start to finish by step-by-step logic at your level — no guessing, ever. Stuck? Ask for the proof.

Today’s daily

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Your level

How deep the logic goes — for the daily and practice alike. Puzzles never need anything deeper than your level.

What logic does each level use?

    Practice

    Endless certified puzzles at your level.

    Play a practice puzzle →
    Toughness: Any

    How much of a workout you want within your level — from quick wins to long hauls.

    Your record

    Certificate of fairness

    Checking today’s daily…
    Guesses required: 0
    See the full logic breakdown

    The Fairness Checker

    Put any puzzle on trial — including today’s NYT — and see whether it secretly requires guessing.

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