Brain Age, also known as Dr. Kawashima's Brain Training, is a puzzle video game for the Nintendo DS that falls within the educational and brain training genres. Inspired by the work of neuroscientist Dr. Ryuta Kawashima, the game consists of a series of short mental challenges and puzzles designed to exercise the brain and assess the player's mental agility. Through activities like simple arithmetic, reading exercises, and Sudoku, players calculate their brain age based on their performance, with the goal of sharpening cognitive functions and maintaining brain health.