Those with a weak brain for math and find Brain Age extremely challenging, there is still hope for you yet with this Japanese title called Math Trainer. It offers a whole gamut of (fun) mathematical problems to solve, from the basic addition and subtraction to the more complex multiplication and division. Needless to say, problems get trickier the further the player progresses in the game. Somehow, Nintendo DS titles that involve a whole lot of brain power and touching seem to lean more toward the smartphone variety.

Source: DS Fanboy