Daily puzzlers would be quick to tell you that sudoku, Wordle’s mathematical cousin, is not as easy as it looks. The small grid, found often next to a word scramble or comic strip in a print newspaper ...

The appeal of sudoku has spread to the prokaryotic world. A strain of Escherichia coli bacteria can now solve the logic puzzles – with some help from a group of students at the University of Tokyo, ...

Not since the Rubik's Cube of 1980 has a puzzle been this hot. From its mind-teasers have sprung clubs, competitions, computer-games and a cult-like following. It has become a fresh way to ...