Tomodachi Collection

Tomodachi Collection is a fun way to see your Miis interact with each other in unexpected ways. You can buy them food, shop for clothes, interiors, and more! I think this is a great little game to play, just make sure you know how to save! (START)

This game is casual fare with simple fun to be had. for those concerned about language barriers, guides are available in order to help you understand the context of your Miis.

...you will love this game. I like "endless" games without any special goal.
You can see this game as some sort of Mii Tamagotchi. Up to 100 Miis can be created who live on an island. You can't directly control them but you're able to listen to their problems and wishes and give them gifts, food or other things to make them happy.
The Miis also interact with each other and sometimes may like to date another Mii or even marry one of them. There are a lot of things to discover.
Also, you can transfer your Miis from your Wii to your DS and vice versa.