Spotted this deal online - not sure if it is the same price in-store.
Dr Kawashimas Brain Training: How Old Is Your Brain? has been enjoyed by people of all ages, including those who would not normally be associated with video games. Inspired by the research of renowned Japanese neuroscientist Dr Kawashima, this original title and the soon to launch More Brain Training are designed to help stimulate your brain and challenge memory, math and perception skills. Users can train their brain by exercising for just a few minutes each day, whether on the go or when relaxing. (info from game.co.uk)