Next, tonight, real answers about keeping your brain sharp for everyone that wants to think fast, remember names. 60 million think they know how to get results. So, how? ABC's linsey Davis reports.... See More
Next, tonight, real answers about keeping your brain sharp for everyone that wants to think fast, remember names. 60 million think they know how to get results. So, how? ABC's linsey Davis reports. Reporter: Imagine if a game that starts off so easy, it looks like child's play, could actually make adults smarter. When 66-year-old Susan Brandt saw her parents starting to lose their memory, she turned to online games called lumosity in an attempt to sharpen her own mind. The single-biggest thing I'm afraid of, is not getting cancer, it's not being able to walk around. It is losing your mind. Reporter: When she started forgetting people's names, this is the game Susan turned to. It's called familiar faces. On my right is maria, Jennifer and that's James. Try to remember those names. We'll come back to them later. Lumostiy, with its 60 million users, is the most popular of several online brain training programs created by neuroscientists. Like a personal trainer, they teach you how to bulk up your brain, like a muscle. Each session lasts about 15 minutes per day. And according to studies, after about ten hours, thousands of people have reported improvement in their memory and problem solving. Things like crossword puzzles and Reading, they're great for keeping you at the level you're at. Reporter: But if you want to expand your abilities, you have to do things that progressively get harder. Dan hurley, a 56-year-old author and award-winning science journalist was skeptical. But is now a convert. He says after using lumosity to train his brain for 3 1/2 months, he actually got smarter. On a test of intelligence, my intellectual abilities increased 16%. Reporter: Hurley says he was better able to multitask and juggle his many demands. So, the notion of you can't teach an old dog new tricks is really out the window? Absolutely. Reporter: So, do you remember these names? Susan says her ability to remember names, both in this game and in real life, has drastically improved. Look, if they're meant to help me, and I like playing them, hello. Win-win. Reporter: Linsey Davis, ABC news, New York.
This transcript has been automatically generated and may not be 100% accurate.