Nintendo Switch Online Game Boy emulator includes Metroid, Mario and Zelda

techradar.com:

Official Game Boy and Game Boy Advance emulators may soon be hitting Nintendo Switch Online, porting a slate of classic titles across the handheld consoles.

As shared by Twitter user trashbandatcoot and spotted by Nintendo Life, leaked files of the emulators have been shared across internet forums. They mention an official Game Boy emulator codenamed “Hiyoko” and a Game Boy Advance emulator named “Sloop”. The leaked files contain screenshots of both emulators being tested on a Nintendo Switch, fuelling rumors that they'll be making their way to Nintendo Switch Online sometime in the future.

Both are described as functional, if buggy, and appear to have been developed by Nintendo Europe Research & Development, which has handled several official Nintendo emulation projects in the past, including Nintendo Switch Online’s NES and SNES library.

Twitter user RatgorlHunter shared a recording of the emulators running on a Nintendo Switch. While the account has since been deleted, stills of the videos can be viewed via the Wayback Machine. Kotaku also reports, through its own sources,  that the emulator only works on Switch dev kits and has seen footage of the emulator running the Game Boy Advance RPG Golden Sun.

So Nintendo's official Game Boy Advance emulator for the Nintendo Switch just leaked. Now it's just a matter of waiting for NSO to add GBA. pic.twitter.com/mEJcKrRtzLApril 18, 2022

Dataminer Mondo Mega has released a full list of all 40 Game Boy Advance games mentioned in the leaked files. The files show they have been tested for the emulator, and include notable picks like Metroid Fusion, Castlevania: Aira of Sorrow, and The Legend of Zelda: The Minish Cap. The full list includes: 

As Mondo Mega highlights, that these games