Nintendo just released a new video sharing a little information about the StreetPass mode in surefire Christmas hit Super Mario 3D Land as well as some of the other recently announced features and characters.

The local sharing function allows players to exchange so-called "Mystery Box" levels with each other. These stages are single boxes containing power-ups and enemies, with the idea being to collect the items and dispatch the enemies, of course. Some give you 1-Ups, others offer Star Medals or just regular power-ups, so here's hoping there's a decent variety of sharing ahead to make StreetPass worthwhile.