Brain Age: Train Your Brain in Minutes a Day! (日本語名：ブレインエイジメンタリング) is a Nintendo DS game released in 2005. It was developed by Nintendo and Dr. Ryuta Kawashima and is part of the Brain Age series. The game is designed to help players improve their mental agility and cognitive abilities by playing a series of mini-games, puzzles and math problems. Players can track their progress over time and receive feedback on their performance. The game also includes a virtual coach, Dr. Kawashima, who encourages and guides players through the activities. Brain Age is easy to pick up and play, making it a great way to improve mental acuity in just a few minutes a day. The game has been praised for its educational content and its ability to help improve cognitive skills.