Brain Age 2: More Training in Minutes a Day! (stylized as Brain Age2), known as More Brain Training from Dr Kawashima: How Old Is Your Brain? in PAL regions,[a] is an edutainment puzzle game and the sequel to Brain Age: Train Your Brain in Minutes a Day! (2005). It was developed and published by Nintendo for the Nintendo DS handheld game console. Before the game begins, the player must perform a Brain Age Check to determine their brain age, which ranges from 20 to 80, to determine approximately their brain's responsiveness. A brain age of 20, the lowest age that the player can achieve, indicates that the player's brain is as responsive as that of an average 20-year-old. After the player is told their initial brain age, they can complete a series of minigames to help improve their brain's responsiveness, after which they can run Brain Age Check again to determine their updated brain age.
Critics were generally favorable towards Brain Age 2, which received aggregated scores of 77% from Metacritic and 79.04% from GameRankings. Praise focused on improvements made on Brain Age, while criticism targeted the game's inability to consistently understand written and spoken answers. The game was voted IGN's Reader's Game of the Month for August 2007. In the United States, it was the 13th best-selling game in its debut month, and climbed to 9th place in September 2007, selling 141,000 copies in that month. In Japan, Brain Age 2 was the best-selling game in its debut month, selling 1,084,857 units. As of July 2007, 5.33 million copies of Brain Age 2 have been sold in Japan. As of March 31, 2013, the game's worldwide sales have reached 14.88 million and it is seventh on the Nintendo DS best-sellers list.