Local Wireless

Local Wireless is the function in and Super Smash Bros. Ultimate in which players can play with other players via wireless connection.

In
Local Wireless is available for Smash, Smash Run, All-Star, and Multi-Man. Upon selecting Local Wireless the player is able to either host or join a game. If the player chooses to host then they have three options for who they would like to be able to join: "Anyone", "Friends Preferred", or "Friends Only". It is one of the ways to play with friends, the other being online in the With Friends mode. Up to four players can join. Local Wireless is the only way to play with other people without an internet connection.

In Super Smash Bros. Ultimate
Local Wireless returns in Ultimate, now located on the Dashboard. One to seven additional players can join a host by linking Nintendo Switch systems and joining a room. Players can also obtain other players' Smash Tags in this mode. Unlike, this is counted as a separate mode from the Smash Menu and can only used for Smash matches. This also means that other game modes are unplayable, likely as to allow more players on the same Nintendo Switch.

Differences

 * Taunts are allowed in local wireless play.
 * When connected in local wireless play, the other players' pick of character is unable to be seen; same goes for online.
 * Custom Smash can be chosen as the game mode, which now has a player limit of 4. Super Sudden Death can be selected as well, but the limit is 8 players instead.
 * The options of others joining are limited to Anyone, Acquaintances (players not on the host's friends list but have encountered before), and Friends Only.

Trivia

 * In Ultimate, if there are 5 or more systems connected to a single local wireless room, a message will be displayed on the hosts screen warning them of the inevitable lag caused by such a condition.