It's an animation based on a game idea I had for a bit. Simplified Concept: "In the overworld, Mario accidentally falls into a pit and lands underground. There, he discovers {redacted}. Injured but determined to escape, Mario tries and searches for a way out while trying to avoid the dangers lurking in the darkness."
Nintendo for the Super Mario Franchise. Sound effects from Youtube and SMB 1. Inspiration of concept by one of the endings of Mario The Music Box Arc / Team Ari.