"Underground (PAL Version) - Super Mario Bros. 2" is a high quality rip of the PAL version of "Underground" from Super Mario Bros. 2.
Joke[]
This is a short arrangement of "Money (That's What I Want)" by Barrett Strong using the instruments of the advertised track. The drums of the original track are mostly unchanged, as well.
This rip might be a reference to the Puzzle Room meme, since the bassline of "Continue?" is based on "Money (That's What I Want)".