StreetPass Mii Plaza
StreetPass Mii Plaza is the place where Mii characters meet and greet! When StreetPass communication is activated, you can exchange Mii data, recent gameplay info, and more with other Nintendo 3DS owners you pass on the street when your Nintendo 3DS system is in Sleep Mode. You'll then be able to see these Mii characters in the plaza the next time you start playing.
Release Date: March 27, 2011