In 1907, the English author and mathematician Henry Ernest Dudeney posed a puzzle: Can any equilateral triangle be cut into ...

Killer sudoku is similar to the other levels in that each of the numbers 1-9 must fit into each 9-by-9 square. No number can ...

Henry Ernest Dudeney posed the famous dissection problem of transforming a triangle into a square by cutting it into as few pieces as possible. In a new study, researchers have finally proved that the ...

The number 2025 can be split into two two-digit numbers: 20 and 25. If we add these together (20 + 25 = 45) and square the ...

At 52-Across, the [Kid-lit character with telekinetic abilities] is MATILDA; next to her, at 54-Across, sits the [“Brand New ...

The students examined the numbers but couldn’t figure it out immediately. The professor smiled and gave them a hint: “Look at the pattern in how the numbers increase. Focus on the differences ...

Rune Factory is filled to the brim with nonograms to puzzle out, both in the traditional black and white and in a stylish colour mode, which turns a collection of 300 items, NPCs, and monsters into a ...

The Nintendo Switch is a natural home for puzzle games since you can easily take them on the go. Here are the best Switch puzzle games you can play right now.

Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter.