"Tomodachi Collection (トモダチコレクション, lit. "Friend Collection") is a life simulation handheld video game for the Nintendo DS. It was released only in Japan on June 18, 2009.
The gameplay is similar to The Sims and Animal Crossing. The gamer uses Miis to interact in this game. Players can transfer their Miis from their Wii console to their Nintendo DS, make friends, perform everyday tasks, and give clothes, food, and special items to the Miis to gain experience. Constructed places can be opened once the player has earned enough in-game money by performing tasks."
Source: Wikipedia, "Tomodachi Collection", available under the CC-BY-SA License.