Sudoku and Logical Thinking: The Science
"Sudoku trains your brain" — a phrase you hear often, but what does the actual scientific research say? Which effects are evidence-based, and which are exaggerated? This article summarizes findings from recent studies.
Study 1: Sudoku and Working Memory
A 2017 study in Frontiers in Psychology found that older adults who regularly solved number puzzles (including Sudoku) scored higher on working memory tests. Researchers suggest that Sudoku requires tracking multiple candidates simultaneously, which exercises working memory updating ability.
Frontiers in Psychology, 2017
Study 2: Sudoku and Cognitive Reserve
A 2019 large-scale study in the International Journal of Geriatric Psychiatry involving 19,000 participants found that older adults who regularly did word and number puzzles had cognitive performance scores equivalent to people 10 years younger. Caveat: this is correlation, not causation — but the data consistently points in the same direction.
International Journal of Geriatric Psychiatry, 2019
Study 3: Transferability of Logical Reasoning
Sudoku trains "if... then..." deductive reasoning. A 2020 meta-analysis showed that after logic puzzle training, participants also improved on other reasoning tasks such as planning and elimination-based problem solving.
Meta-analysis, 2020
Important Limitations
Most of the above studies are observational (correlational), not randomized controlled experiments (causal). There is currently no strong evidence that Sudoku can prevent Alzheimer's disease. However, as a low-cost, accessible mental activity, incorporating it into your daily routine has no downsides — even if just to keep your mind active.
Bottom line: Current research supports Sudoku as an effective brain training tool — but it should not replace a balanced diet, regular exercise, and social interaction. Overall health is the best strategy for healthy aging. Sudoku is one piece of the puzzle — but an important one.