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🔥 Hard · 30 given numbers · ID hard-17

Hard Sudoku No. 17

A hard puzzle with exactly one solution. Techniques needed: naked single, hidden single, xy-wing.

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Sudoku · HardNo. 17 · ID hard-17
Hard Sudoku No. 17Row 1: blank, blank, 2, 1, blank, blank, blank, 6, blank. Row 2: blank, 7, 6, blank, blank, 5, blank, 8, blank. Row 3: 4, blank, blank, blank, blank, 6, 5, blank, blank. Row 4: blank, blank, 4, 8, 9, blank, 7, 5, blank. Row 5: blank, blank, blank, blank, blank, blank, blank, blank, blank. Row 6: blank, 1, 5, blank, 4, 2, 6, blank, blank. Row 7: blank, blank, 8, 2, blank, blank, blank, blank, 9. Row 8: blank, 4, blank, 5, blank, blank, 8, 2, blank. Row 9: blank, 6, blank, blank, blank, 7, 1, blank, blank.216765846548975154268294582671
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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.

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Scientists trust me only after trying to prove me wrong; assume me without testing and I am just a guess. What am I?

Type:LogicScience
Reveal answer

The answer is

A hypothesis

Hints and details
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You can count along me, divide me, make me negative, and still never reach my final member. What am I?

Type:Math
Reveal answer

The answer is

The number line

Hints and details
hardAdults
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Eight is correct after five plus three, wrong after five times three, and meaningless on a blank page. What am I?

Type:Logic
Reveal answer

The answer is

An answer without context

Hints and details
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