Meanwhile, Shute does have one small hope for her study: That it encourages other scientists studying the cognitive benefits of video games to use more rigorous controls. Often, video-game studies compare sophisticated, well-designed games with something simple, like Solitaire or Tetris, Shute explains. That's not a fair comparison because study volunteers will already expect not to improve their brains with Solitaire, while they may expect to improve playing a more sophisticated game. "The more conservative approach is to have something equally as plausible and equally as active," Shute says. Well-known brain-training games, like Lumosity, fit the bill.