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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.


  • The artbook mentions Ghost Fight is inspired by the battle music from the RPG OFF, and was composed before Undertale existed.
  • The track is played at 0.9 speed in the Fangamer Demo.[1]


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