The aim is to find four words that link together into a category, with there being four groups in total. Each group is coded by a color to indicate difficulty: yellow for the easiest, followed by green, blue, and purple for more challenging sets.

It quickly became a global sensation, with some players sharing their answers, along with hints and tips, on social media each day. Such was the game's popularity that, in January 2022, it was bought by The New York Times for an undisclosed low seven-figure sum,