Dr. Kawashima's Brain Training: How Old Is Your Brain? is an entertainment video game that employs puzzles. Brain Training presents quick mental activities that help keep your DS brain in shape. Activities include quickly solving simple math problems, counting people going in and out of a house simultaneously, drawing pictures on the Touch Screen, reading classic literature out loud, and more. You can also play Sudoku, the number puzzle game which has become an extremely popular feature in U.S. newspapers Brain Age is inspired by the research of Professor Ryuta Kawashima, a prominent Japanese neuroscientist. His studies evaluated the impact of performing certain reading and mathematic exercises to help stimulate the brain.