Word sequence puzzles constitute fascinating (and fun) experiments in associative thinking—that is, experiments in how we make semantic, conceptual, or formal connections among the words in a set.

Dr. Emma Chen, a renowned mathematician, has set the international math community abuzz with her latest numerical sequence puzzle. This challenging brain teaser has stumped even the most brilliant ...

Here’s a classic brainteaser that I don’t like. What’s the next number in this sequence: 1, 11, 21, 1211, 111221, …? The answer is 312211, because each number describes the digits in the number that ...

Fans of BBC's Only Connect were left scratching their heads over a tricky sequence puzzle, with many calling it 'impossible' ...