https://wccftech.com/super-mario-3d-all-stars-emulators/

The GameCube and Wii emulators that power Super Mario Sunshine and Super Mario Galaxy in Super Mario 3D All-Stars can potentially run any game.

OatmealDome, who has been taking a good look at the game since before its official release, discovered that the two emulators implement more features than are needed to run Mario Sunshine and Mario Galaxy, like Bounding Box, which is used in the Paper Mario games.