A recent study has revealed that a specific free online brain game could potentially lower the risk of dementia by 25%. Conducted with nearly 3,000 participants aged 65 and older, the research highlights the importance of engaging in cognitive training, particularly through speed-training video games. This finding is significant for anyone looking to maintain mental sharpness as they age. The study involved participants divided into groups, with one group engaging in a speed-training game that required quick decision-making.