Metroid: Boss Battle Music (Ridley Fight)

Metroid: Boss Battle Music (Ridley Fight) is an update on Super Smash Bros. Dojo!!. It reveals SSBB's remix of the boss battle theme from various Metroid games, most famously fights with Ridley. It is unknown what this music is from, as it could be a character's theme, a stage BGM, or something else. Although it may at first appear that this confirms or at least hints at Ridley as a playable character, one should remember that music from Balloon Fight and Mach Rider were present in Melee, but neither the Balloon Fighter or the Mach Rider were playable.