Covid, party and Boris are all five-letter words. But none of them has got the nation talking more than the five-letter words that make up the hit online puzzle Wordle. Don’t worry, there are no spoilers here.

The game, which is free and was launched in October, looks simple and friendly. You have six attempts in which to guess a five-letter word, putting letters into a grid. If the box turns gray it means the letter isn’t in the answer, yellow means it is but you’ve put it in the wrong spot, and green means it’s in the correct place.