Two of the 3DS's built in SteetPass games have been revealed: A turn-based tower RPG and a 3D puzzle-building game.
The 3DS includes wireless technology known as SteetPass to pair up owners on the move without ever meeting - receiving data from kids, adults, grandparents without ever lifting a finger. Games like Super Street Fighter IV use StreetPass for wireless battles and trophy collecting. Nintendo has some of their own tricks for anonymous 3DS engaging - StreetPass Quest an StreetPass Puzzle.
In StreetPass Quest you play a Mii trapped inside a cage within a huge tower. Nintendo, how kinky! Anyway, your goal is to escape by teaming up with collected Mii (received via SteetPass) in a series of turn based battles - according to 3DS focus, there's around 32 levels in total.
In StreetPass Puzzle however, it sees you collecting pieces of a 3D puzzle from other 3DS owners using StreetPass.