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Brain-training puzzle games can help you get better at the games themselves, and studies in older adults report gains on some related cognitive tests. But the evidence does not establish that these games broadly improve everyday thinking or prevent dementia. The key distinction is between getting better at a practiced task and carrying that improvement over to different skills or daily life.
What does “good for your brain” mean?
A higher score on a puzzle or training app shows progress on that activity. It does not, on its own, show that memory, reasoning, or independence in everyday life has improved.
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- Near transfer: improvement on the trained game or a similar task, such as a test that uses comparable attention or memory skills.
- Far transfer: improvement on substantially different skills or everyday functioning, such as managing daily tasks more effectively.
Studies can find near-transfer gains without demonstrating far transfer. Improvement on a game, a laboratory test, or a selected cognitive measure should not be treated as evidence that a person is less likely to experience cognitive decline or dementia.
What have studies of brain-training games found?
The findings are mixed because reviews examine different programs, populations, outcomes, and comparison groups. Taken together, they support the possibility of improvement in some measured skills, not a blanket claim that brain games make people smarter.
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Reviews reporting gains in specific test domains
A 2021 review by Wang and colleagues pooled 15 trials involving 759 older adults. Compared with control groups, it reported effects for processing speed (g = 0.23), selective attention (g = 0.40), and short-term memory (g = 0.35). The authors described game-based training as a supplementary intervention for community-dwelling older adults and called for larger, well-designed trials. Those results concern the domains tested; they do not establish a general improvement in daily functioning. Read the Wang et al. review.
A 2020 meta-analysis of 16 studies and 1,543 healthy adults older than 60 found statistically significant changes in processing speed (SMD 0.40, 95% CI 0.20–0.60), working memory (0.21, 95% CI 0.08–0.34), executive function (0.21, 95% CI 0.06–0.35), and verbal memory (0.12, 95% CI 0.01–0.24). It did not find significant changes in attention or visuospatial ability. The authors also noted limitations involving blinding and intention-to-treat analysis, and said the studies were insufficient to determine whether these games prevent clinical dementia. Read the Scientific Reports meta-analysis.
Reviews finding limited evidence for broader transfer
A 2021 systematic review and meta-analysis examined seven commercially available programs in healthy older adults and older adults with mild cognitive impairment. Across 43 studies and 2,636 participants, the authors found small near-transfer effects. For the mild cognitive impairment sample, they found no far-transfer effect, and judged the evidence insufficient for broad claims about memory, general cognition, or everyday functioning. Their conclusion was that there was “currently insufficient empirical evidence” that brain training improves those broader outcomes. Read the 2021 review.
One game study is not proof about all games
A 2014 randomized study had healthy older adults complete 20 one-hour sessions using selected non-action games from Lumosity. The training group improved on certain cognitive measures. That is evidence about one specific intervention and set of outcomes—not proof that every puzzle app produces the same results or that the gains improve everyday life. Read the study.
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Do puzzle games prevent dementia or Alzheimer’s disease?
The evidence reviewed here does not establish that brain-training puzzle games prevent dementia or Alzheimer’s disease. Some studies measure performance on cognitive tests; that is not the same as showing reduced dementia risk or delayed clinical decline. The 2020 meta-analysis specifically found too few studies to determine whether commercial computerized games prevent clinical dementia.
Why results differ from one review to another
“Brain games” are not one standardized intervention. Reviews may include different game designs, study durations, participant groups, and control conditions. They also measure different outcomes: one may test speed or short-term memory, while another asks whether gains carry over to other skills or daily functioning. A statistically significant result in one test domain is not a verdict on every game or every kind of benefit.
Most evidence summarized here concerns older adults. It should not automatically be generalized to children, younger adults, every puzzle genre, or people receiving clinical care. The reviews also do not identify one commercial app as best or establish a universal training schedule.
How to judge a brain-training claim
Before choosing an app—or believing a promise about its benefits—check what was actually studied:
- Skill: What exact ability does the game practice?
- Intervention: Was the specific game tested, or does the claim rely on a related but different program?
- Outcome: Did participants improve at the game, on a similar test, on a different skill, or in daily functioning?
- Participants: Who took part, and does that group match the person the claim is about?
- Comparison: What did researchers compare the training with?
- Practical fit: Is the time commitment, cost, accessibility, and style enjoyable enough to keep playing?
One review’s subgroup analysis suggested a preference for non-time-pressure or supported formats among older-adult studies. That result is not a universal prescription; it does not establish the best format for every person or goal.
Is it still worth playing puzzles?
Yes, if you enjoy the challenge. Sudoku, logic puzzles, and brain-training apps can be enjoyable ways to spend time, and the evidence leaves room for gains in particular practiced or related skills. The important boundary is not to treat enjoyment or a better score as proof of broad cognitive improvement or disease prevention.
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