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.
Local Wireless is located on the Dashboard. Two to eight players can join by linking Nintendo Switch systems. Unlike Super Smash Bros. for Nintendo 3DS, 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.