Game Boy and Game Boy Advance games are coming to Nintendo Switch Online
Those that subscribe to Nintendo Switch Online will be able to play Game Boy games on their Switch, later today. Tetris, Super Mario Land 2, The Legend of Zelda: Link's Awakening DX, Gargoyle's Quest, Game & Watch Gallery 3, Alone in the Dark: The New Nightmare, Metroid II, Wario Land 3 and Kirby's Dreamland will all be available. You can use various filters to mimic the look of various versions of Game Boy. Online play is supported, too.
The Legend of Zelda: Oracle of Seasons, Ages, Pokemon: TCG, Kirby's Tilt and Tumble, and more are on the way later.
GBA games can be played by those who are a part of the NSO Expansion Pack. Those games today are, Super Mario Advance 4, WarioWare Inc., Kuru Kuru Kururin, Mario Kart: Super Circuit, Mario and Luigi Superstar Saga, and Zelda: The Minish Cap. Games like Metroid: Fusion, Kirby and the Amazing Mirror, F-Zero Maximum Velocity, Fire Emblem, and Golden Sun will come later.