🔥 Hard · 27 given numbers · ID hard-22

Hard Sudoku No. 22

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

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Sudoku · HardNo. 22 · ID hard-22

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

hard Middle school

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A cube is painted on all sides and cut into 27 equal smaller cubes. How many small cubes have paint on exactly one face?

Type:Logic

Reveal answer

The answer is

Hints and details

hard Middle school

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What is the maximum number of pieces from 3 straight cuts across a round cake, if each cut crosses all previous cuts inside the cake?

Type:Logic

Reveal answer

The answer is

Hints and details

hard Middle school

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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

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