If you are looking to play the theme yourself, several resources provide tutorials and tabs: Fallen Down | Undertale Вики | Fandom

Моим главным вдохновением была тема Game Over из первой Зельды. Мне нравилось, насколько странно успокаивающей она ощущалась. Кто- Wiki Undertale Fallen Down (Reprise) | Undertale Вики | Fandom

To understand the foundation of "Underbase," it helps to know the original's structure:

: Like many SiIvaGunner rips, it subverts expectations by presenting what looks like a standard game track but replacing the instruments or melody with a humorous or unexpected reference. Reference for "Fallen Down" (Original Track)

: In Undertale , this theme plays during interactions with Toriel in the Ruins. Learning to Play

: Written in the key of D Major . The intro specifically starts on an F# note.