You can chat with other Nintendo gamers for games from the Wii and later.
You can explore Game Builder Garage games that everyone else has made.
You can share your favorite moments in your favorite games.
You can collect Play Coins to unlock different parts of the server.
You can compete with other players on the Leaderboard.
SwitchPass let's you share and recieve Miis and Friend Codes from other people across the world.
Make new friends with other people from across the world, and play online with them.