Does Sudoku make you smarter?

Sudoku can exercise attention, working memory, and logical reasoning, but there is no good evidence that it raises general intelligence or makes someone broadly smarter. You usually improve most at the skills and puzzle patterns you practice.

What the research shows

Large observational studies have found that people who frequently do number puzzles tend to score better on several cognitive tests. One study of 19,078 adults aged 50 to 93 found a close relationship between number-puzzle frequency and cognitive performance. An earlier study of more than 65,000 participants also reported associations with reasoning and memory scores.

Those studies show association, not cause. People with stronger cognitive skills may choose puzzles more often, and puzzle solvers may differ in education, health, or other habits. The results do not prove that Sudoku increases IQ.

A realistic benefit

Sudoku gives you focused practice in holding candidates in mind, applying constraints, noticing contradictions, and sustaining attention. That makes it a worthwhile mental activity and a satisfying skill to improve. Treat it as one part of an active life, not as a substitute for sleep, exercise, social contact, education, or medical care.