Expert Jigsaw Sudoku Online
Free 9×9 jigsaw puzzles at the hardest tier — sparse givens, irregular regions, extreme technique.
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All-TimeExpert Jigsaw Sudoku is the hardest tier we generate. With 24–26 givens spread across nine irregular regions, almost every move comes from technique rather than scanning — swordfish, XY-Wing, Unique Rectangle, and chains all show up regularly, often forced through the irregular region shape. Sessions take real time; even confident solvers spend 30–60 minutes here. Sudoku247Online runs every Expert puzzle through the same region-aware uniqueness checker as the lower tiers, so the answer is always pinned to a single legal solution — no guesswork required, just patient deduction.