1:48 What If Gaster's Theme Was a Full Song? 0:35 Undertale - Gaster's Theme 3:48 Undertale OST - Gaster's Theme? 5:05 Glitchtale OST - Vantablack [Gaster's Theme] 5:44 Playing All Secret Piano Songs Perfectly + Gaster's Theme – Deltarune Chapter 4 4:10 Gaster's Waltz (☼︎☜︎✞︎⚐︎☹︎✞︎☜︎) (Deltarune UST) 0:24 Undertale OST – Gaster's Theme (Samsung Cover) 2:38 KAIZO - Deltarune Secret Boss Theme 2:36 Battle Against a True Hero with the FREEDOM MOTIF 5:17 3d Sans fight \"no hit\" (and Gaster) (Undertale fan game) \"better quality\" 4:59 The Man Who Got Hands - DELTARUNE UST (Fan-Made W.D. Gaster Boss Theme) 2:55 Deltarune Chapter 5 - Blumenkönig + TRAPPED IN ASYLUM (Asgore Final Boss Battle Theme) 5:45 Gaster's Theme [Undertale/Deltarune UST] 3:23 UNDERTALE - Gaster's theme [ 8th Anniversary ] 2:45 Gaster's Theme – UNDERTALE | Arrangement 0:36 Gaster's Theme but with Freedom Leitmotif 4:17 Coolio - Gangsta's Paradise (feat. L.V.) [Official Music Video] 3:43 [Undertale] Gaster's Theme Remix - W. D. Gaster's Megalovania (amella Remix) 1:25 Animated [Undertale Remix] SharaX - Dark Darker Yet Darker