If you have an active Switch Online account, you'll be able to play a slew of SNES titles starting September 5th.
Super Mario World,
Super Mario World 2: Yoshi's Island, and
Super Mario Kart will be playable online, with voice chat, freely available to anyone with an active Switch Online account. In addition, you'll be able to purchase SNES-style wireless controllers as well, for $29.99 each.
Mario titles aren't the only SNES games being added to the Switch tomorrow; the full roster of SNES games includes
The Legend of Zelda: A Link to the Past, Super Metroid, Stunt Race FX, Kirby's Dream Land 3, Star Fox, F-Zero, Pilotwings, Kirby's Dream Course, and third party titles such as
Brawl Brothers, Breath of Fire, Demon's Crest, Joe and Mac 2, Super E.D.F., Super Ghouls'n Ghosts, Super Puyo Puyo 2, Super Soccer, and
Super Tennis.