Power of "NEO"

Power of "NEO" is 99th track in the UNDERTALE Soundtrack. This short and repetitive track plays when the player fights Mettaton NEO near the end of the Genocide Route. Its melody references the opening notes of Battle Against a True Hero.

The reason largely believed by fans to why the track isn't "complete", is because of how short the interaction will last during this battle, as Mettaton NEO will die to only one attack no matter what.