GameZone - Preview, by Michael Lafferty: "Just thinking about Sudoku Gridmaster is enough to make the brain throb just a bit. And that is what any good puzzler should do." - http://nds.gamezone.com/gzreviews/p29231.htm
IGN - Preview, news, screenshots, and a video. - http://ds.ign.com/objects/824/824483.html
GameSpy - Provides information, screenshots, and a preview. - http://gba.gamespy.com/nintendo-ds/sudoku-gridmaster/
GameSpot - News, previews, images, videos, links, and a forum. - http://www.gamespot.com/ds/puzzle/sudokugridmaster/