Are you ready for More Brain Training — More than 10 million people worldwide have made Dr Kawashima's Brain Training for Nintendo DS a part of their lives. The good doctor is back with even more exercises to continue stimulating the different parts of the brain! More Brain Training from Dr Kawashima: How Old Is Your Brain? features all-new exercises and DS Brain Age Checks that will challenge even the most trained brains! People young and old will enjoy the new training exercises that test a person's memory, math and perception skills. All a person needs is a few minutes a day to give his or her brain a proper workout.