🔥 Hard · 27 given numbers · ID hard-71
Hard Sudoku No. 71
A hard puzzle with exactly one solution. Techniques needed: naked single, hidden single, pointing pair, naked pair, hidden pair.
The sheet below is exactly what prints on one A4 or Letter page. Choose “Save as PDF” in the print dialog if you prefer a file.
Keyboard: arrow keys to move, 1–9 to fill, Backspace to erase, N to switch notes.
Solution (hidden until you want it)
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About this puzzle
Hard puzzles require at least one advanced pattern: hidden pairs, naked or hidden triples, X-Wing or XY-Wing. Looking for a different challenge? Easy, Medium or Expert puzzles are on the printable Sudoku page.
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Try a hard riddle
Sudoku and riddles train the same muscle: spotting what must be true. Here are a few hard riddles with answers.