Nintendo is slated to shut down the Nintendo Wi-Fi Connection service worldwide as of today.
Nintendo is shutting down the Wi-Fi Connection, discontinuing the online play, matchmaking and leaderboard services for the DS, DSi and Wii. Affected titles include Mario Kart Wii, Super Smash Bros. Brawl, and Pokémon Black & White. A complete list of affected titles has been provided by Nintendo here.
Obviously, game functionality not requiring any internet connection remains unchanged. A number of online features are still available to DS and Wii users, including:
Nintendo DS Browser
Amazon Instant Video
Nintendo DSi Browser
Nintendo DSi Shop
Nintendo Wi-Fi Connection Pay & Play
Wii Shop Channel
The Wii-U and 3DS are not affected, due to their usage of the Nintendo Network, the direct successor of Nintendo’s Wi-Fi Connection. However, games accessed through Wii Mode on the updated platforms will have their online functionality cut off.
The first games to use Wi-Fi Connection were Mario Kart and Tony Hawk’s American Sk8land for DS, back in 2005. The first Wii game to use Wi-Fi connection was Pokémon Battle Revolution the next year.