According to Nintendo, on page 47 of the Brain Training manual it gives hints on how to use the voice recognition properly. Suggestion number four is: "Pronounce each word as clearly as possible, and try to avoid using strong dialects or accents." Just check out Nicole Kidman saying scissors in a Nintendo ad to see how things could go wrong with accents. Nintendo claims it has been continually monitoring the voice recognition efficiency in its software since the game launched in June '06. We believe them, just as long as we don't have to say the color blue, or yellow if we're from Manchester.