Hyper Sudoku — printable PDFs
Hyper Sudoku (Windoku) adds four extra 3×3 regions to the grid — one in each quadrant, offset from the standard boxes so they overlap parts of four boxes each. Each hyper region must also contain digits 1–9 exactly once. The overlap is the point: a digit blocked from one half of a hyper region by a row or column will be forced into the other half, even when the standard box scan never made that obvious. The four hyper regions show as thick borders on every printed grid.
Rules: standard Sudoku rules plus four extra 3×3 hyper regions (the inner-offset squares marked with the heaviest borders) must each contain digits 1–9 with no repeats. When a row or column scan stalls, check the hyper regions — they pull constraint information across box boundaries that nothing else does.
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Easy
Easy puzzles are solvable with plain row, column, and box scanning — no pencil-mark techniques required. A good choice for kids learning the rules, for warm-ups, or for a relaxed evening solve.
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Medium
Medium puzzles start to need basic pencil-mark techniques: naked pairs (two cells in a unit that can only be two specific digits) and hidden singles across wider units. A typical solve runs 7–15 minutes.
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Hard
Hard puzzles introduce locked candidates, pointing pairs, and box-row interactions. Expect 15–25 minutes per puzzle if you're comfortable with those techniques — and steady pencil-mark discipline.
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Expert
Expert puzzles lean on X-wings, coloring, and combined chain logic. Not a starting tier — but a natural step if you've been finishing Hard in ten minutes or less.
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