Nintendo Wi-Fi Connection, or WFC, is a service from Nintendo that allows the Nintendo Wii and Nintendo DS games and applications to connect to the Internet. Super Smash Bros. Brawl is one of the many games that can use the WFC to brawl online with friends or with anyone, and send Snapshots and Replays. In addition, players could also get daily vault data. Vault data is basically the items people have submitted. The player gets a player-made map, replay, and image. After leaving Wi-Fi, they get the option to submit only 1 item from either their maps, replays, or images. If the player is lucky, their item will be chosen and everyone who comes on Wi-Fi the next day will receive the item for that day only. However, a message came to people who entered Wi-Fi that as of 6/30/09, they will no longer receive Vault data.
Wi-Fi Multiplayer is a feature of SSBB. There are two types: "With Friends" or "With Anyone". "With Friends" is with people that you have exchanged Friend Codes with. Within "Friend List", players can create and edit up to four personalized text messages, for use during matches. Each message corresponds to one of the four taunt buttons. Pressing the appropriate button in an online battle will (as usual) perform the taunt, and will also display the message. "With Anyone" has the same online functionality, but players may not show text or a nickname (concealing the player's identity in this mode). There are no records kept in the "With Anyone" mode. Each player will have 45 seconds to choose their character for the match, and vote for a stage of desire. It will cost one coin to place a vote, while it is free to select a random stage. While searching for opponents and waiting for them to select their characters/stages, a player can practice on Sandbag. Since it's not possible to see what selections the other players are making, co-ordinating With Friends Team Battles can be difficult. The game also does not force players to change outfits when two players chose the same character and outfit. (With team battles, the player's outfit (and team) will automatically be chosen. However, Overalls Wario will never be chosen.) As with characters on the same team, the first character appears normally, while the second has a light tint, the third has a dark tint, and the fourth an even darker tint.
 Error Codes
If there is an error while using Wi-Fi, these codes will appear: