- For the minigame, see Thundersnail.
"Thundersnail" is the 42nd track of the Undertale Soundtrack. It plays during the snail race on Napstablook's family farm. As stated by Toby Fox on his Twitter, "Thundersnail" was entirely made from one audio sample of a xylophone, with some slight editing.
- "Thundersnail" resembles the intro of the song "F-F-Fire!" from Mother 3.