Puzzles are a popular way of getting the old grey matter ticking over.

One brain-bending problem – which it is claimed can only be solved by people with a high IQ – has gone viral on TikTok. The video clip posted, by @selfdevelopment71, has had more than 1.2 million views – with many people giving wrong answers.

The puzzle asks viewers to figure out a pattern of numbers – and work out what the number six is equal too in the sequence. The answer is so deceptively simple that you’ll kick…