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Ghost Fight is the 10th track in the Undertale Soundtrack and the 9th track in the Undertale Demo OST. This piece has jazz influences, and it plays during the battle against Napstablook. It is composed entirely with instruments from the EarthBound soundfont.

It has a unique loop in the Undertale Demo OST.


  • The artbook mentions Ghost Fight is inspired by "Pepper Steak," OFF's primary battle theme.
  • The track is played at 0.9 speed in the Fangamer Demo.[1]
  • The bassline of the song is similar to the bassline of another one of Toby Fox's songs, "Noisemaker's Theme", which also influenced "It's Showtime!"


  1. Undertale Demo Stream by Fangamer (03 May, 2013) - Part 4 - YouTube