- For the actual track that plays when you fight Sans, see MEGALOVANIA.
"Song That Might Play When You Fight Sans" is the 72nd track in the Undertale Soundtrack. It is similar to a sped up version of the song "sans." This song is unused, and Toby Fox may have added it to the soundtrack to misguide players into believing that Sans would have a battle at some point in the Neutral Route.
- This song is not in the game files.
- Much of this song is made with instruments from the SNES version of Mega Man X3, particularly its iconic guitar sounds.
- This song bears a striking resemblance to the final boss theme of Yoshi's Island: "Giga Baby Bowser."