Daily Hard Sudoku X
A fresh hard Sudoku X puzzle every visit — fewer givens, diagonal-led deductions.
Solve every day to build your streak — a free account saves your daily solves and climbs the leaderboard.
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All-TimeThe daily hard Sudoku X stretches the technique repertoire you've built up on classic. With 22–25 givens, you'll need hidden pairs, naked triples, X-Wing, and diagonal-aware versions of the box-line family. Sudoku X has its own technique cluster — X-cycle on a diagonal, pointing pair across a diagonal — that only appears at this tier. Every daily hard Sudoku X on Sudoku247Online is verified uniquely solvable by pure logic; the diagonal never forces a guess, it just shortens the deduction. Plan on 25–45 minutes.