The archive
Sudoku puzzle archive
122 puzzles, each graded by the hardest technique its solution actually requires — not by clue count. Every one has its own page, its own notes, and a hint button that teaches.
Easy · 40
Singles all the way — a relaxed scan.
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Medium · 40
Subsets and intersections start to bite.
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Hard · 40
X-Wings and XY-Wings; slow and rewarding.
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Evil · 2
Swordfish-grade. Rare, and a proper fight.
Want endless fresh puzzles instead? Every difficulty page has a New puzzle button. Or learn the techniques behind the grades.