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🧠 Expert · 26 given numbers · ID expert-70

Expert Sudoku No. 70

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

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Sudoku · ExpertNo. 70 · ID expert-70
Expert Sudoku No. 70Row 1: 3, 9, blank, blank, blank, 2, blank, blank, blank. Row 2: blank, blank, 7, blank, 3, blank, blank, 1, blank. Row 3: blank, blank, 1, blank, blank, blank, blank, blank, 6. Row 4: blank, 7, 6, 4, blank, blank, blank, 3, blank. Row 5: 8, blank, blank, blank, blank, blank, blank, blank, 2. Row 6: blank, 3, blank, blank, blank, 6, 1, 9, blank. Row 7: 2, blank, blank, blank, blank, blank, 9, blank, blank. Row 8: blank, 1, blank, blank, 9, blank, 4, blank, blank. Row 9: blank, blank, blank, 3, blank, blank, blank, 2, 7.39273116764382361929194327
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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 have a 5-litre jug and a 3-litre jug. How can you measure exactly 4 litres?

Type:Logic
Reveal answer

The answer is

Fill 5, pour into 3, empty 3, pour remaining 2 into 3, fill 5, then top up the 3-litre jug.

Hints and details
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
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