Games similar to NeuroDual include Lumosity, which has a free version. Other options are N-Back Challenge. Between them they cover Android, iPhone, iPad and the web.
Lumosity.com grounds all of its brain exercises in extensive research; Scientific Advisory Board includes researchers from such institutions as UCSF and Stanford.
United States
The N-Back Challenge provides a special type of cognitive training, “dual n-back,” that helps you raise your IQ in just a few minutes per day. Sounds implausible? The N-Back Challenge is based on a decade’s worth of scientific studies, published in top peer-reviewed journals...
