"Dr. Kawashima's Brain Training: How Old Is Your Brain?" is an educational video game for the Nintendo DS platform released in 2008 in Europe. Developed by Nintendo, the game challenges players to train their brains by solving various math problems and logic puzzles. It also allows players to track their progress and compare their scores with others, encouraging them to keep their brains active and young. The game supports both stylus and touch screen input, making it engaging and interactive for users of all ages.