- 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.