Controlled trials are the gold standard for cause-and-effect evidence, but they are usually small — dozens or low hundreds of people. A 2021 study took a different, complementary approach: looking at thousands of older adults' actual game-playing habits and measuring how they lined up with cognitive test scores.

What researchers did

Researchers analyzed data from 3,271 adults aged 65 and older, looking specifically at how often people played word games (crosswords, Scrabble, and similar) and card or strategy games (like chess), alongside standard measures of cognitive functioning — memory, attention, and reasoning tasks used broadly in aging research.

What they found

Both word games and card/strategy games were independently linked to higher cognitive functioning scores, even after accounting for other factors like education and general health. Word games showed the stronger of the two associations.

An honest note on what this kind of study can and can't show

This is what researchers call an observational study: it shows a real pattern — people who play these games more often tend to score higher on thinking tests — but it cannot, on its own, prove the games caused the higher scores. It is possible that people who already think more clearly are simply more drawn to games like crosswords in the first place. That is exactly why it matters alongside a trial like the Devanand crossword study, which randomly assigned people to play or not — the two kinds of evidence support each other from different angles.

Why this fits Mind Vitality's approach

Why We Rotate Eight Kinds of Puzzles already makes the case for variety over mastering one format — this study's inclusion of both word games and strategy games, each showing its own independent link, is a reasonable part of why that variety is worth having, not just one puzzle type repeated forever.

What we won't claim

We won't tell you playing these games guarantees sharper thinking — this kind of study cannot prove that on its own. What it does offer is a large, real-world data point that lines up with the smaller controlled trials on the same subject, from a different angle.