Are jigsaw puzzles good for your brain?

A half-finished jigsaw on the dining table is one of the quietest invitations in a house. You walk past, find one edge piece, and twenty minutes vanish. It feels good for you. So, are jigsaw puzzles good for your brain? The honest answer is “possibly, but not in the way the adverts suggest”, and the best study on the question is worth knowing about, because it is unusually candid.

What do jigsaw puzzles do for the brain?

They use a lot of thinking skills at once. In a 2018 study at Ulm University in Germany, researchers tested 100 cognitively healthy adults aged 50 and over. How quickly someone could do a 40-piece puzzle was linked with all eight thinking abilities the team measured: perception, constructional skill (putting parts together into a whole), mental rotation, speed, flexibility, working memory, reasoning and episodic memory.^[1]

The caveat is the important part. Showing that puzzling draws on many abilities is not the same as showing it builds them. A hard hill walk uses your legs, your lungs and your balance, but whether it improves any of them is a separate question. For jigsaws, that separate question was tested directly.

Does doing jigsaw puzzles make you smarter?

Not in the short term, on the best evidence we have. The same team ran a randomised controlled trial, set out in advance in a published protocol.^[2] Of the 100 adults, 52 were asked to do jigsaws at home for at least an hour a day on 30 days within five weeks. On average they put together about 3,589 pieces in 49 hours. The other 48 had four sessions of advice about keeping their thinking healthy.^[1]

The puzzle group got better at puzzles. But on the main outcome, overall visuospatial thinking across those eight abilities, they did not improve more than the comparison group. Both groups improved a little, which is common when people are tested twice.^[1]

There is a hint of something more: within the puzzle group, people who puzzled more showed slightly more change once their starting scores were taken into account, but the authors themselves call this only marginally significant.^[1] Two more honest details. The puzzlers reported 11 minor, temporary side effects against none in the comparison group, including back and shoulder pain, headache and, rather charmingly, a “craving” to solve puzzles. And the trial was funded by a puzzle manufacturer, which the paper declares openly. A funder with an interest that still published a null result is, if anything, reassuring.

Do jigsaw puzzles help prevent dementia?

There is no good evidence that they do. The Ulm study measured thinking skills in healthy adults, not dementia, and a month of daily puzzling made no measurable difference to those skills.^[1]

What the researchers did find was that people who reported more puzzling over their lifetime tended to have better visuospatial skills, even after allowing for age, education and how many other social, physical and mental activities they did. They describe long-term puzzling as a potential protective factor for cognitive ageing.^[1] The caveat is that this is an association based on people remembering their own puzzling history. People with sharper visuospatial skills may simply enjoy jigsaws more, so they do more of them. The authors’ own summary is that long-term, but not short-term, puzzling could benefit thinking.

This is general information, not medical advice. If you are worried about your memory, or someone else’s, the right first step is a GP appointment, not a box of puzzles.

Are jigsaw puzzles good for your brain as an adult?

Yes, in a gentler sense than “brain training”. The research does not show that jigsaws upgrade your mind. But a jigsaw has qualities that are increasingly rare in an adult day. It is slow. It does not ping. It always has a next step, one more piece, so it is easy to sink into. And it ends: the picture is finished and you can stop.

Those are the same ingredients that make other analogue hobbies so absorbing, and they are close cousins of the deep, unhurried attention described in what is flow state. For many people, an hour on a jigsaw is an hour their attention gets to rest from being pulled in ten directions. That is worth having, even without a cognitive score attached.

Are jigsaw puzzles a waste of time?

No, not if you enjoy them. “Is it productive?” is the wrong test for a hobby. A jigsaw is calm, screen-free, sociable if you want it to be, and quietly satisfying. That is plenty.

The caveat is only about the marketing. If a puzzle is sold to you as protection against dementia or a way to get cleverer, be sceptical: the trial evidence does not support that yet. Do them because you like them. If you would like a family version, a puzzle left out on the table works well alongside the ideas in our guide to family board games.

What were jigsaw puzzles originally called?

Dissected puzzles, or dissected maps. The London engraver John Spilsbury is credited with inventing them in the 1760s. They were printed paper maps glued onto wood, usually mahogany, and cut into pieces, so that children could learn geography by taking the map apart and putting it back together. The V&A holds one of his earliest, a map of England and Wales dated 1767 in which each piece is a county.^[3]

So jigsaws began as a learning tool, which may be why we still half expect them to be good for us. Two and a half centuries later, the more honest pitch is simpler: they are a lovely way to spend a slow afternoon.