Is Sudoku Good for Your Brain? What Research Says
Sudoku is a good workout for working memory, attention and logical reasoning, and large studies find that people who do number puzzles often score better on thinking tests. But those studies show a link, not proof: nobody has shown that Sudoku itself sharpens your mind or prevents dementia. Play it because you enjoy it and it challenges you, and pair it with exercise and an active social life.
What your brain does during a Sudoku
A Sudoku has no maths in it, but it asks a lot of a few mental skills at once. You hold several facts in mind while you check a cell (working memory), scan rows, columns and boxes for what's missing (attention), and rule options out step by step (deductive reasoning). Harder puzzles add planning: keeping track of candidates and spotting patterns among them.
That's why Sudoku feels tiring in a good way. The question researchers ask is whether exercising these skills in a puzzle makes them stronger in everyday life.
What the research says
Puzzle fans score better on thinking tests
The biggest study of number puzzles comes from the online PROTECT study in the UK. Brooker and colleagues (2019, International Journal of Geriatric Psychiatry) asked 19,078 healthy adults aged 50 to 93 how often they did number puzzles such as Sudoku, then gave them a battery of cognitive tests. The more often people did puzzles, the better they tended to score on measures of attention, reasoning and memory.
A smaller study points the same way. Cutting, Copeland and McNab (2023, Heliyon) tested the working memory of 181 adults aged 60 to 81 and asked which digital games they played. Those who mainly played puzzle games, including Sudoku, word searches and crosswords, held information in mind and ignored distractions about as well as the younger adults in the study.
But a link isn't proof
Both studies are correlational: they compare people who already do puzzles with people who don't. That can't tell us which way round the effect goes. People who stay sharp may simply enjoy puzzles more, and puzzle fans may differ in education, health or lifestyle. The researchers say so themselves, and the puzzle habits were self-reported.
Does it slow down ageing?
Studies that follow the same people for years give a more mixed answer. Staff, Hogan, Williams and Whalley (2018, BMJ) followed 498 people from Aberdeen, born in 1936, for up to 15 years. Those who reported more intellectual engagement, including problem solving, had higher thinking scores, but their scores fell at the same rate as everyone else's. In the authors' words, it gave them a higher starting point rather than protection from decline.
Altschul and Deary (2019, The Journals of Gerontology: Series B) followed 1,091 people in the Lothian Birth Cohort 1936 from age 70 to 79. Those who played more games (the question covered cards, chess, bingo and crosswords) showed less cognitive decline, especially in memory. It's an encouraging result, but it is again observational, and it didn't look at Sudoku on its own.
Does practice carry over to daily life?
This is where the evidence is weakest. A large review of commercial brain-training research by Simons and colleagues (2016, Psychological Science in the Public Interest) found that people reliably get better at the tasks they practise, but found little evidence that the gains spread to different tasks or to everyday life. There's no reason to think Sudoku is an exception: doing lots of Sudoku certainly makes you better at Sudoku.
So, is Sudoku good for your brain?
| Claim | What the evidence says |
|---|---|
| Sudoku exercises memory, attention and logic | Yes. That's simply what solving one involves. |
| Puzzle fans have sharper thinking | On average, yes, in large studies of older adults. |
| Sudoku causes that sharper thinking | Not shown. The studies can't separate cause from effect. |
| Sudoku slows mental ageing | Mixed. Some long studies see less decline, others don't. |
| Sudoku prevents dementia | No evidence. Researchers are careful not to claim it. |
Health bodies are equally cautious. The World Health Organization's 2019 guidelines on reducing the risk of cognitive decline say cognitive training may be offered to older adults, a deliberately hedged recommendation, while physical activity should be recommended. If you want to look after your brain, a daily walk has firmer backing than a daily puzzle. The good news is you don't have to choose.
How to get the most out of Sudoku
- Keep it challenging. A puzzle you can finish on autopilot isn't stretching you. When Easy feels quick, move up a level.
- Learn new techniques instead of repeating the same one. On GameLake, Easy needs singles, Medium needs pairs and Hard needs box-line techniques; Stuck on a Sudoku? explains them.
- Use hints to learn, not to finish. GameLake's Teach me circles the numbers to look at and explains the step in plain words, so you pick up the reasoning.
- Mix it up. Variety means new kinds of thinking: try nonograms, Minesweeper or a crossword alongside Sudoku.
- Make it a habit you enjoy. A short daily puzzle is easy to keep up. The Daily Sudoku is the same for every player and builds a streak.
- Don't stop there. Exercise, good sleep and time with other people all matter for a healthy brain.
New to the game? Start with How to Play Sudoku, then play a puzzle at the level that keeps you thinking.
Frequently asked questions
Is Sudoku good for your brain?
It exercises working memory, attention and reasoning, and people who do number puzzles often score better on thinking tests. But studies show a link, not proof that Sudoku causes better thinking.
Does Sudoku prevent dementia?
There's no good evidence that it does. Studies of puzzle players are observational, and researchers are careful not to claim that puzzles reduce dementia risk.
Does Sudoku improve memory?
Older adults who play puzzle games tend to have better working memory, but no study has shown that Sudoku causes the improvement. You will certainly get better at Sudoku itself.
Is Sudoku better than crosswords for the brain?
There's no good evidence either way. They use different skills (logic and numbers versus words and knowledge), so doing both adds variety.
How often should I play Sudoku?
As often as you enjoy it. A daily puzzle at a level that challenges you is a good habit, alongside exercise and social activities.