Brain Age Express: Sudoku (Chotto Brain Training: Sudoku in Japan) is a DSiWare video game released in 2009 by Nintendo and is the third installment of the Brain Age series. The game features the standard grid of squares where you make a row across or down that must feature all the numbers from 1 to 9, as well as the 3x3 grids. This DSiWare-related article is a stub. You can help the Nintendo Wiki by expanding it.