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The Guardian - UK
The Guardian - UK
Science
Alex Bellos

Can you solve it? Chapeau! A smart new hat puzzle

Ade Carl
Winter woollen bunnetBYRH9T Winter woollen bunnet

Today’s puzzle is a new twist on a classic genre: the “common knowledge” hat riddle in which logicians deduce facts about their hats based on what they know, and what they know others know.

Head sums

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