Two newspaper workers examine a freshly printed proof beside a press in a London newspaper office in 1944

Puzzle history ·

The Crossword in Wartime

In 1944, D-Day codewords appeared in a newspaper crossword and brought MI5 to a schoolmaster's door. The true story is stranger—and less tidy—than the legend.

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Close-up of a partly completed printed Sudoku with handwritten numbers filling several cells

Puzzle design ·

Why Some Puzzles Feel Fair

A difficult puzzle can be merciless and still feel fair. The difference is not kindness. It is whether the puzzle keeps its promises.

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Matchsticks arranged on a pale surface to form the figures nine and six with a minus sign between them

Puzzle psychology ·

What Makes an “Aha” Moment?

Pine, crab, sauce. Sometimes a puzzle answer arrives whole and feels instantly right. Psychology has been studying that strange little jolt.

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