Undertale is a 2015 2D role-playing video game created by American indie developer Toby Fox. The player controls a child named Frisk who has fallen into the Underground: a large, secluded region under the surface of the Earth, separated by a magical barrier.
All songs are composed by the game's creator Toby Fox. The soundtrack album is mostly in the order of when the respective song appears in the game. But due to multiple endings and outcomes the game has, some songs only play in one outcome.
Soundtrack[]
| Song no. | Song | Neutral | True Pacifist | Genocide | Demo | Hard Mode | Other Games |
|---|---|---|---|---|---|---|---|
| 1 | Once Upon A Time | Yes | Yes | Yes | Yes | Yes | |
| 2 | Start Menu | Yes | Yes | Yes | Yes | Yes | |
| 3 | Your Best Friend | Yes | Yes | Yes | Yes | Yes | |
| 4 | Fallen Down | Yes | Yes | Yes | Yes | Yes | |
| 5 | Ruins | Yes | Yes | Yes | Yes | Yes | |
| 6 | Uwa!! So Temperate♫ | Yes | Yes | Yes | No | Yes | |
| 7 | Anticipation | Yes | Yes | Yes | Yes | Yes | |
| 8 | Unnecessary Tension | Yes | Yes | Yes | Yes | Yes | |
| 9 | Enemy Approaching | Yes | Yes | Yes | Yes | No | |
| 10 | Ghost Fight | Yes | Yes | Yes | Yes | Yes | |
| 11 | Determination | Yes | Yes | Yes | Yes | Yes | |
| 12 | Home | Yes | Yes | Yes | Yes | Yes | |
| 13 | Home (Music Box) | Yes | Yes | Yes | Yes | Yes | |
| 14 | Heartache | Yes | Yes | Yes | Yes | Yes | |
| 15 | sans. | Yes | Yes | Yes | No | No | |
| 16 | Nyeh Heh Heh! | Yes | Yes | Yes | Yes | No | |
| 17 | Snowy | Yes | Yes | Yes | No | No | |
| 18 | Uwa!! So Holiday♫ | Yes | Yes | Yes | No | Yes | |
| 19 | Dogbass | Yes | Yes | Yes | No | No | |
| 20 | Mysterious Place | Yes | Yes | Yes | No | No | |
| 21 | Dogsong | Yes | Yes | Yes | No | Yes | |
| 22 | Snowdin Town | Yes | Yes | No | No | No | |
| 23 | Shop | Yes | Yes | Yes | No | No | |
| 24 | Bonetrousle | Yes | Yes | Yes | No | No | |
| 25 | Dating Start! | Yes | Yes | Yes | No | No | |
| 26 | Dating Tense! | Yes | Yes | No | No | No | |
| 27 | Dating Fight! | Yes | Yes | No | No | No | |
| 28 | Premonition | Yes | Yes | No | No | No | |
| 29 | Danger Mystery | Yes | Yes | Yes | No | No | |
| 30 | Undyne | Yes | Yes | Yes | No | No | |
| 31 | Waterfall | Yes | Yes | Yes | No | No | |
| 32 | Run! | Yes | Yes | Yes | No | No | |
| 33 | Quiet Water | Yes | Yes | Yes | No | No | |
| 34 | Memory | Yes | Yes | Yes | No | No | |
| 35 | Bird That Carries You Over A Disproportionately Small Gap | Yes | Yes | No | No | No | |
| 36 | Dummy! | Yes | Yes | No | No | No | |
| 37 | Pathetic House | Yes | Yes | Yes | No | No | |
| 38 | Spooktune | Yes | Yes | No | No | No | |
| 39 | Spookwave | Yes | Yes | No | No | No | |
| 40 | Ghouliday | Yes | Yes | No | No | No | |
| 41 | Chill | Yes | Yes | No | No | No | |
| 42 | Thundersnail | Yes | Yes | No | No | No | |
| 43 | Temmie Village | Yes | Yes | Yes | No | No | |
| 44 | Tem Shop | Yes | Yes | Yes | No | No | |
| 45 | NGAHHH!! | Yes | Yes | No | No | No | |
| 46 | Spear Of Justice | Yes | Yes | No | No | No | |
| 47 | Ooo | Yes | Yes | Yes | No | No | |
| 48 | Alphys | Yes | Yes | No | No | No | |
| 49 | It's Showtime! | Yes | Yes | No | No | No | |
| 50 | Metal Crusher | Yes | Yes | No | No | No | |
| 51 | Another Medium | Yes | Yes | Yes | No | No | |
| 52 | Uwa!! So HEATS!!♫ | Yes | Yes | Yes | No | Yes | |
| 53 | Stronger Monsters | No | No | No | No | Yes | |
| 54 | Hotel | Yes | Yes | Yes | No | No | |
| 55 | Can You Really Call This A Hotel, I Didn't Receive A Mint On My Pillow Or Anything | Yes | Yes | No | No | No | |
| 56 | Confession | Yes | Yes | No | No | No | |
| 57 | Live Report | Yes | Yes | No | No | No | |
| 58 | Death Report | Yes | Yes | No | No | No | |
| 59 | Spider Dance | Yes | Yes | Yes | No | No | |
| 60 | Wrong Enemy !? | Yes | Yes | Yes | No | No | |
| 61 | Oh! One True Love | Yes | Yes | No | No | No | |
| 62 | Oh! Dungeon | Yes | Yes | No | No | No | |
| 63 | It's Raining Somewhere Else | Yes | Yes | No | No | No | |
| 64 | CORE Approach | Yes | Yes | Yes | No | No | |
| 65 | CORE | Yes | Yes | Yes | No | No | |
| 66 | Last Episode! | Yes | Yes | No | No | No | |
| 67 | Oh My... | Yes | Yes | No | No | No | |
| 68 | Death By Glamour | Yes | Yes | No | No | No | Dance Dance Revolution A3, Dance Dance Revolution GRAND PRIX |
| 69 | For The Fans | Yes | Yes | No | No | No | |
| 70 | Long Elevator | Yes | No | Yes | No | No | |
| 71 | Undertale | Yes | No | No | No | No | |
| 72 | Song That Might Play When You Fight Sans | No | No | No | No | No | |
| 73 | The Choice | Yes | No | No | No | No | |
| 74 | Small Shock | Yes | Yes | Yes | No | No | |
| 75 | Barrier | Yes | Yes | No | No | No | |
| 76 | Bergentrückung | Yes | Yes | No | No | No | |
| 77 | ASGORE | Yes | No | No | No | No | |
| 78 | You Idiot | Yes | No | No | No | No | |
| 79 | Your Best Nightmare | Yes | No | No | No | No | |
| 80 | Finale | Yes | No | No | No | No | Dance Dance Revolution A3 |
| 81 | An Ending | Yes | No | No | No | No | |
| 82 | She's Playing Piano | Yes | Yes | No | No | No | |
| 83 | Here We Are | No | Yes | No | No | No | |
| 84 | Amalgam | No | Yes | No | No | No | |
| 85 | Fallen Down (Reprise) | No | Yes | No | No | No | |
| 86 | Don't Give Up | No | Yes | No | No | No | |
| 87 | Hopes And Dreams | No | Yes | No | No | No | |
| 88 | Burn In Despair! | No | Yes | No | No | No | |
| 89 | SAVE The World | No | Yes | No | No | No | |
| 90 | His Theme | No | Yes | No | No | No | |
| 91 | Final Power | No | Yes | No | No | No | |
| 92 | Reunited | No | Yes | No | No | No | |
| 93 | Menu (Full) | No | Yes | No | No | No | |
| 94 | Respite | No | Yes | No | No | No | |
| 95 | Bring It In, Guys! | No | Yes | No | No | No | |
| 96 | Last Goodbye | No | Yes | No | No | No | |
| 97 | But The Earth Refused To Die | Yes | No | Yes | No | No | |
| 98 | Battle Against A True Hero | Yes | No | Yes | No | No | Dance Dance Revolution A3, Dance Dance Revolution GRAND PRIX, DanceRush Stardom |
| 99 | Power Of "NEO" | No | No | Yes | No | No | |
| 100 | MEGALOVANIA | No | No | Yes | No | No | Dance Dance Revolution A3 |
| 101 | Good Night | No | No | No | Yes | No |