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🧠 Expert · 26 given numbers · ID expert-23

Expert Sudoku No. 23

A expert puzzle with exactly one solution. Techniques needed: naked single, hidden single, pointing pair, naked pair, xy-wing, forcing chain.

Puzzles per page

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Sudoku · ExpertNo. 23 · ID expert-23
Expert Sudoku No. 23Row 1: blank, blank, blank, blank, 7, 1, blank, blank, 9. Row 2: blank, 6, 7, blank, blank, blank, 5, 4, blank. Row 3: blank, 9, blank, 6, blank, blank, blank, blank, blank. Row 4: 7, blank, blank, 1, 8, blank, blank, blank, blank. Row 5: blank, 5, blank, blank, blank, blank, blank, 9, blank. Row 6: blank, blank, blank, blank, 9, 2, blank, blank, 3. Row 7: blank, blank, blank, blank, blank, 8, blank, 7, blank. Row 8: blank, 4, 6, blank, blank, blank, 3, 5, blank. Row 9: 5, blank, blank, 2, 3, blank, blank, blank, blank.71967549671859923874635523
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About this puzzle

Expert puzzles need at least one top-tier technique: naked or hidden quads, Swordfish or a forcing chain (testing a two-candidate cell and following the consequences). Looking for a different challenge? Easy, Medium or Hard puzzles are on the printable Sudoku page.

Need a break from the numbers?

Try a hard riddle

Sudoku and riddles train the same muscle: spotting what must be true. Here are a few hard riddles with answers.

hardMiddle school
🤔

You get 1 gift on day 1, 2 gifts on day 2, 3 gifts on day 3, and so on up to 12 gifts on day 12. How many gifts do you get altogether?

Type:MathSeasonal
Reveal answer

The answer is

78 gifts

Hints and details
hardMiddle school
🤔

Two elves guard two doors, and one door leads to Santa's workshop. One elf always tells the truth and the other always lies, but you do not know which is which. You ask either elf, "Which door would the other elf say leads to the workshop?" The elf points to Door A. Which door really leads to the workshop?

Type:LogicSeasonal
Reveal answer

The answer is

Door B

Hints and details
hardMiddle school
🤔

Two fathers and two sons share three cookies so everyone gets one. How is that possible?

Type:Math
Reveal answer

The answer is

They are a grandfather, a father and a son

Hints and details
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