IQ tests help determine an individual's intelligence. These types of puzzle challenges present readers with problems in the ...

Fewer than one in five people pass this IQ test, thought to be the shortest in the world at only three questions long. The Cognitive Reflection Test has a pass rate of just 17 per cent, leaving the ...

This viral optical illusion hides the number 23 in plain sight, but spotting it isn’t as easy as it sounds. If you consider yourself a puzzle legend or visual master, take a look at the image that’s ...