Game Boy™ - Nintendo Switch Online - Nintendo Official Site

Play classic Game Boy games like Kirby's Dream Land™, Metroid™ II - Return of Samus™, and Wario Land™ 3 anytime, anywhere on the Nintendo Switch system with Nintendo Switch Online.
Game Boy™ – Nintendo Switch Online

Game Boy™ - Nintendo Switch Online - Nintendo Official Site

Game Boy Advance™ - Nintendo Switch Online – Nintendo Official Site

Sources claim that Game Boy Color games are headed to Nintendo Switch Online's service

Game Boy™ - Nintendo Switch Online - Nintendo Official Site

Nintendo Switch's Game Boy Player Isn't As Exciting As It Should Be

New Gameboy Titles on Nintendo Switch Online

Game Boy Color - Wikipedia

Game Boy™ - Nintendo Switch Online - Nintendo Official Site

Game Boy Advance™ - Nintendo Switch Online – Nintendo Official Site

Nintendo Switch Online - Nintendo - Official Site

Nintendo Switch Online - Nintendo - Official Site

Game Boy™ - Nintendo Switch Online - Nintendo Official Site

Play Classic Games with Nintendo Switch Online - Nintendo Official Site