The ads are always quite careful to avoid promising anything outright. "brain training," "testing," "compare your score with global averages." Technically, Lumo

The ads are always quite careful to avoid promising anything outright. "brain training," "testing," "compare your score with global averages." Technically, Lumosity IS training your brain... to do better at Lumosity games. It's obviously vaguely promising cognitive gains, but it manages to talk around it extremely well.