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Only the fearless may proceed.
Brave ones, foolish ones.
Both walk not the middle road.
A sign in the Ruins

You ever hear of a talking flower?
— Sans

But nobody came.

I cannot fight.
I cannot think.
But, with patience, I will make my way through.
A sign in the CORE

seeing the hope and happiness that undertale has brought to people...
it fills me with determination.
Toby Fox

Down here... It's kill or be killed!
Flowey's motto.

Don't you have anything better to do?
Flowey, if you replay the intro repeatedly

Don't you have anything better to do?
Photoshop Flowey, after killing you nine times

Don't you have anything BETTER to do?
Flowey, if you spared him and then defeated Asgore repeatedly

Don't you have anything better to do?
Annoying Dog at the end of "Hard Mode"

Don't you have anything better to—
I already said that.
Exchange between Flowey and the Annoying Dog on the end screen of Hard Mode

Frisk... Don't you have anything better to do?
Asriel, if you seek him out and talk to him exhaustively at the end of a True Pacifist run

It's you!
— Examining the mirror in the Ruins

Despite everything, it's still you.
— Examining the mirror in the Castle

Still just you, Frisk.
— Examining the Ruins mirror in the true pacifist epilogue

It's me, [Player].
— Examining any mirror on a No Mercy run

Long ago, two races ruled over the Earth: HUMANS and MONSTERS. One day, they all disappeared without a trace.
— The intro after Flowey kills Asgore and force-closes the game on a Neutral run

This is all just a bad dream...
And you're never waking up!
Photoshop Flowey's Game Over


Eh, don't count on it.
— Hard Mode ending


Sans: hey. what's up? this game's got pretty good graphics, huh? too bad the light's off so you can't see any of them.
Sans: over here.
(light turns on, showing Sans and Papyrus)
Sans: hmm, you wanna know?
(shot pulls back to show Sans and Papyrus standing atop a Nintendo Switch)
Sans: we're on it.
Undertale on Nintendo Switch. Coming...Eventually

    Toriel's Cell 

Say Hello

Toriel: This is Toriel. You only wanted to say hello...? Well then. 'Hello!' I hope that suffices. Hee hee.

Toriel: This is Toriel. You want to say hello again? 'Salutations!' Is that enough?

Toriel: This is Toriel. Are you bored? I should have given a book to you. My apologies. Why not use your imagination to divert yourself? Pretend you are... A monarch! Rule over the leaf pile with a fist of iron. Can you do that for me?

Toriel: This is Toriel. Hello, my child. Sorry, I do not have much to say. It was nice to hear your voice, though.

About Yourself

Toriel: This is Toriel. You want to know more about me? Well, I am afraid there's not much to say. I am just a silly old lady who worries too much!

Call Her "Mom"

Toriel: Huh? Did you just call me... "Mom"? Well... I suppose... Would that make you happy? To call me... "Mother"? Well then, call me whatever you like!


Toriel: ... huh??? Oh, heh.. heh... Ha ha ha! How adorable... I could pinch your cheek! You can certainly find better than an old woman like me.

Toriel: Oh dear, are you serious...? I do not know if this is pathetic, or endearing.

(after calling Toriel "Mom")

Toriel: Oh dear, are you serious...? And after you said you want to call me "mother..." You are an... ..."interesting" child.

    No Mercy Sans Snowdin Dialogue 

Sans: well, i'll be straight-forward with you. my brother'd really like to see a human. so, y'know, it'd really help me out... if you kept pretending to be one.

Sans: hey... puzzles might be fun. if you tried them.

Sans: hmmm... guess we didn't need your help to have a good time after all. ... say, i've been thinking. seems like you're gonna fight my brother pretty soon. here's some friendly advice. if you keep going the way you are now... ... you're gonna have a bad time.

    Snowdin Library 

(It’s a school report about monster funerals.)
Monster funerals, technically speaking, are cool as heck.
When monsters get old and kick the bucket, they turn into dust.
At funerals, we take that dust and spread it on that person’s favorite thing.
Then their essence will live on in that thing...
Uhhh, am I at the page minimum yet?
I’m kinda sick of writing this.
Red book

While monsters are mostly made of magic, human beings are mostly made of water.
Humans, with their physical forms, are far stronger than us.
But they will never know the joy of expressing themselves through magic.
They’ll never get a bullet-pattern birthday card...
Blue book

Because they are made of magic, monsters’ bodies are attuned to their SOUL.
If a monster doesn’t want to fight, its defenses will weaken.
And the crueller the intentions of our enemies, the more their attacks will hurt us.
Therefore, if a being with a powerful SOUL struck with the desire to kill...
Um, let’s end the chapter here...
Orange book

Fearing the humans no longer, we moved out of our old city, HOME.
We braved harsh cold, damp swampland, and searing heat...
Until we reached what we now call our capital.
Again, our King is really bad at names...?
Light green book

Love, hope, compassion...
This is what people say monster SOULs are made of.
But the absolute nature of “SOUL” is unknown.
After all, humans have proven their SOULs don’t need these things to exist.
Dark green book

    Waterfall Ancient Glyphs 

(Ancient writing covers the walls... you can just make out the words.)
“The War of Humans and Monsters.”

Why did the humans attack? Indeed, it seemed that they had nothing to fear. Humans are unbelievably strong. It would take the SOUL of nearly every monster... Just to equal the power of a single human SOUL. But humans have one weakness. Ironically, it is the strength of their SOUL. Its power allows it to persist outside the human body, even after death. If a monster defeats a human, they can take its SOUL. A monster with a human SOUL... A horrible beast with unfathomable power.

(It’s an illustration of a strange creature...)
(There’s something very unsettling about this drawing.)

The power to take their SOULs. This is the power that the humans feared. This power has no counter. Indeed, a human cannot take a monster’s SOUL. When a monster dies, its SOUL disappears. And an incredible power would be needed to take the SOUL of a living monster.
There is only one exception. The SOUL of a special species of monster called a “Boss Monster.” A Boss Monster’s SOUL is strong enough to persist after death... If only for a few moments. A human could absorb this SOUL. But this has never happened. And now it never will.

The humans, afraid of our power, declared war on us. They attacked suddenly, and without mercy. In the end, it could hardly be called a war. United, the humans were too powerful, and us monsters, too weak. Not a single SOUL was taken, and countless monsters were turned to dust...

Hurt, beaten, and fearful for our lives, we surrendered to the humans. Seven of their greatest magicians sealed us underground with a magic spell. Anything can enter through the seal, but only beings with a powerful SOUL can leave. There is only one way to reverse this spell. If a huge power, equivalent to seven human SOULs, attacks the barrier... It will be destroyed. But this cursed place has no entrances or exits. There is no way a human could come here. We will remain trapped down here forever.

Without candles or magic to guide them Home, the monsters used crystals to navigate.

However... There is a prophecy. The Angel... The One Who Has Seen The Surface... They will return. And the underground will go empty.

    Undyne's pre-battle speech 
Seven. Seven human souls and King ASGORE will become a god. Six. That's how many we have collected thus so far. Understand? Through your seventh and final soul, this world will become transformed. First, however, is as customary for those who make it this far... I shall tell you the tragic tale of our people. It all started, long ago...



YOU! You're standing in the way of everybody's hopes and dreams! Alphys's history books made me think [that] humans were cool, with their giant robots and flowery swordswomen. BUT YOU? You're just a coward! Hiding behind that kid so you could run away from me again!

(If you have not befriended Undyne before) And let's not forget your wimpy goody-two-shoes-shtick! Oooh! I'm making such difference by hugging random strangers! You know what would be more valuable to everyone? IF YOU WERE DEAD!!! That's right, human! Your continued existence is a crime! Your life is all stands between us and freedom! Right now, I can feel everyone's hearts pounding together! Everyone's been waiting their whole lives for this moment! But we're not nervous at all. When everyone put their hearts together, they can’t lose! Now, human! Let’s end this, right here, right now. I’ll show you how determined monsters can be. Step forward when you’re ready! Fufufufu.

(If you have befriended Undyne before) And! And! ... and something's been bothering me, too. The whole time I was chasing after you... I felt something... Strange. The echoes of something warm, something... Something like "I miss being friends with you." BUT THAT'S RIDICULOUS! I WOULD NEVER GET CHUMMY WITH A COWARD LIKE YOU! You! You must have been mind-controlling me! Manipulating people to make them like you... What a Grade-A FREAK! Now enough! For everyone's hopes! For everyone's dreams! And for my own freaking dignity! I, UNDYNE, will knock you down!

Killed monsters, but not Papyrus


YOU! You're standing in the way of everybody's hopes and dreams! Alphys's history books made me think [that] humans were cool, with their giant robots and flowery swordswomen. BUT YOU? You're just a remorseless criminal! You wander through the caverns, attacking anyone in your path. Self-defense? Please. You didn't kill them because you had to. You killed them because it was easy for you. Because it was fun for you. Do you think it was fun when I found out...? Do you think it's fun when people's family members never come home? Is that fun? No.

But your time's up, villain! You won't hurt anyone else. A knight in shining armor has appeared. And all the pain you inflicted on the fallen... Every hope, every dream you've turned to dust... She's gonna send right back through her spear! NGAHHH! I'll show you how determined monsters truly are! Come on! Step forward and let's end this!

Killed Papyrus

Forget it.

Look. Papyrus didn't come to his meeting today. Say what you want about him. He's weird, he's naive, he's self-absorbed. But Papyrus has NEVER missed a meeting. And no matter what time you call him on the phone... Night, day, afternoon, morning... He ALWAYS answers within the first two rings.
But now he's gone. And his brother isn't around, either.
What did you do to him? What did you DO TO HIM? Papyrus, who I have trained every day... Even though I KNOW he's too goofy to ever hurt anyone...
Go ahead. Prepare however you want. But when you step forward... I will KILL you.

Unmarked spoilers from here on below!


    The Undertale 
A long time ago, a human fell into the RUINS.
Injured by its fall, the human called out for help.
ASRIEL, the king's son, heard the human's call.
He brought the human back to the castle.
Over time, ASRIEL and the human became like siblings.
The King and Queen treated the human child as their own.
The underground was full of hope.
Then... One day...
The human became very ill.
The sick human had only one request.
To see the flowers from their village.
But there was nothing we could do.
The next day.
The next day.
The human died.
ASRIEL, wracked with grief, absorbed the human's SOUL.
He transformed into a being with incredible power.
With the human SOUL, ASRIEL crossed through the barrier.
He carried the human's body into the sunset.
Back to the village of the humans.
ASRIEL reached the center of the village.
There, he found a bed of golden flowers.
He carried the human onto it.
Suddenly, screams rang out.
The villagers saw ASRIEL holding the human's body.
They thought that he had killed the child.
The humans attacked him with everything they had.
He was struck with blow after blow.
ASRIEL had the power to destroy them all.
ASRIEL did not fight back.
Clutching the human...
ASRIEL smiled, and walked away.
Wounded, ASRIEL stumbled home.
He entered the castle and collapsed.
His dust spread across the garden.
The kingdom fell into despair.
The king and queen had lost two children in one night.
The humans had once again taken everything from us.
The king decided it was time to end our suffering.
Every human who falls down here must die.
With enough souls, we can shatter the barrier forever.
It's not long now.
King ASGORE will let us go.
King ASGORE will give us hope.
King ASGORE will save us all.
You should be smiling, too.
Aren't you excited?
Aren't you happy?
You're going to be free.

    Flowey's final speech in the No Mercy route 

"Howdy, [Player]! You finally made it home. Remember when we used to play here? Hee hee hee... Boy! Today's gonna be just as fun.

I remember when I first woke up here, in the garden. I was so scared. I couldn't feel my arms or my legs... My entire body had turned into a flower! "Mom! Dad! Somebody help me!" I called out. But nobody came.

Eventually, the king found me, crying in the garden. I explained what had happened to him. Then he held me, [Player]. He held me with tears in his eyes, saying... "There, there. Everything is going to be alright." He was so... Emotional. But... For some reason... I didn't feel anything at all.

I soon realized I didn't feel ANYTHING about ANYONE. My compassion had disappeared! And believe me, it's not like I wasn't trying. I wasted weeks with that stupid king, vainly hoping I would feel something. But it became too much for me. I ran away from home. Eventually, I reached the RUINS. Inside I found HER, [Player]. I thought of all people, SHE could make me feel whole again. ... She failed. Ha ha...

I realized those two were useless. I became despondent. I just wanted to love someone. I just wanted to care about someone. [Player], you might not believe this... But I decided... It wasn't worth living anymore. Not in a world without love. Not in a world without you. So... I decided to follow in your footsteps. I would erase myself from existence. And you know what? I succeeded.

But as I left this mortal coil... I started to feel apprehensive. If you don't have a SOUL, what happens when you...? Something primal started to burn inside me. "No," I thought. "I don't want to die!" ... Then I woke up. Like it was all just a bad dream. I was back at the garden. Back at my "save point."

Interested, I decided to experiment. Again and again, I brought myself to the edge of death. At any point, I could have let this world continue on without me. But as long as I was determined to live... I could go back. Amazing, isn't it, [Player]? I was amazed, too.

At first, I used my powers for good. I became "friends" with everyone. I solved all their problems flawlessly. Their companionship was amusing... For a while. As time repeated, people proved themselves predictable. What would this person say if I gave them this? What would they do if I said this to them? Once you know the answer, that's it. That's all they are.

It all started because I was curious. Curious what would happen if I killed them. "I don't like this," I told myself. "I'm just doing this because I HAVE to know what happens." Ha ha ha... What an excuse! You of all people must know how liberating it is to act this way. At least we're better than those sickos that stand around and WATCH it happen... Those pathetic people that want to see it, but are too weak to do it themselves. I bet someone like that's watching right now, aren't they...?

Nowadays, even that's grown tiring. You understand, [Player]. I've done everything this world has to offer. I've read every book. I've burned every book. I've won every game. I've lost every game. I've appeased everyone. I've killed everyone. Sets of numbers... Lines of dialog... I've seen them all. But you... YOU'RE different. I never could predict you, [Player].

When I saw you in the RUINS, I didn't recognize you. I thought I could frighten you, then steal your SOUL. I failed. And when I tried to load my save file... It didn't work. [Player]... Your DETERMINATION! Somehow, it's even greater than mine!

I just have one question for you, [Player]. How did you get back to the RUINS from here...? ... wait, I know. She must have taken you when she left. And decided to give you a proper burial, rather than... Hanging out in the basement forever. ... but, why then...? What made you wake up? Did you hear me calling you...?

It doesn't matter now. I'm so tired of this, [Player]. I'm tired of all these people. I'm tired of all these places. I'm tired of being a flower. [Player]. There's just one thing left I want to do. Let's finish what we started. Let's free everyone. Then... let's let them see what humanity is REALLY like! That despite it all... This world is still "kill or be killed!!"

Then...? Well. I had... Been entertaining a few ways to use that power. Hee hee hee... ... But seeing you here changed my mind. [Player]... I think if you're around... Just living in the surface world doesn't seem so bad.

We don't even need to leave to get them this time. The king has six of them locked away. I've tried hundreds of ways to get him to show me them... But he just won't. [Player]... I know he'll do it for YOU.

Why am I telling you all of this? [Player], I said it before. Even after all this time... You're still the only one that understands me. You won't give me any worthless pity!

Creatures like us... Wouldn't hesitate to KILL each other if we got in each other's way. So that's... So... that's... Why... ... ha... Ha... ... what's this... feeling? Why am I... Shaking? ... Hey... [Player]... No hard feelings about back then, right? ... H-Hey, what are you doing!? B... back off!!

I... I've changed my mind about all this. This isn't a good idea anymore. Y-you should go back, [Player]. This place is fine the way it is! ... S-s-stop making that creepy face! This isn't funny! You've got a SICK sense of humor!"

    The Judgment 

Sans: So you finally made it. The end of your journey is at hand. In a few moments, you will meet the king. Together... You will determine the future of this world. That's then. Now. You will be judged. You will be judged for your every action. You will be judged for every EXP you've earned. What's EXP? It's an acronym. It stands for "execution points." A way of quantifying the pain you have inflicted on others. When you kill someone, your EXP increases. When you have enough EXP, your LOVE increases. LOVE, too, is an acronym. It stands for "Level of Violence." A way of measuring someone's capacity to hurt. The more you kill, the easier it becomes to distance yourself. The more you distance yourself, the less you will hurt. The more easily you can bring yourself to hurt others.


Sans: ... but you. you never gained any LOVE. 'course, that doesn't mean you're completely innocent or naive. just that you kept a certain tenderness in your heart. no matter the struggles or hardships you faced... you strived to do the right thing. you refused to hurt anyone. even when you ran away, you did it with a smile. you never gained LOVE, but you gained love.

Sans: does that make sense? maybe not. ... now. you're about to face the greatest challenge of your entire journey. your actions here... will determine the fate of the entire world. if you refuse to fight... asgore will take your soul and destroy humanity. but if you kill asgore and go home... monsters will remain trapped underground. what will you do? ... well, if i were you, i would have thrown in the towel by now. but you didn't get this far by giving up, did you? that's right. you have something called "determination." so long as you hold on... so long as you do what's in your heart... i believe you can do the right thing. alright. we're all counting on you, kid. good luck.

Neutral Default

Sans: Now, you understand. It's time to begin your judgment. Look inside yourself. Have you really done the right thing? And, considering what you've done... What will you do now? Take a moment to think about this.

Sans: ... truthfully, it doesn't really matter what you said. all that's important is that you were honest with yourself. what happens now...we leave up to you.

  • If Papyrus Was Killed...

    Sans: though... one thing about you always struck me as kinda odd. now, i understand acting in self-defense. you were thrown into those situations against your will. but... sometimes... you act like you know what's gonna happen. like you've already experienced it all before. this is an odd thing to say, but... if you have some sort of special power... isn't it your responsibility to do the right thing?
    (answering with "yes") ah. i see. ... T h e n w h y 'd y o u k i l l m y b r o t h e r ?
    (answering with "no") heh. well, that's your viewpoint. i won't judge you for it. ... Y o u d i r t y b r o t h e r k i l l e r.

Judgments based on LV

Sans: huh? you looked bored. i get the feeling you aren't gonna learn anything from this. well, guess i gotta judge you then.

LV 1 with EXP

Sans: ... huh? what's with that look in your eye? did you go through and kill someone... just to see what i'd say about it? wow. you're a pretty gross person, huh?

LV 2

Sans: lv2... seems like you messed up the slightest amount. welp. that's pretty sad. you probably weren't even aware of what you were doing... and when you learned, it was too late. nah, just kidding. who gets to lv2 on accident? get outta here.

LV 3

Sans: lv3... 3's just an ok number, i guess. i'll give you a C+. you can do better, right?

LV 4-9

Sans: hmmm... over lv3, huh. you killed some people on purpose, didn't you? that's probably bad. though, maybe some of it was in self-defense... i don't know. help me out here. i wasn't watching. anyways, don't do that.

LV 10-14

Sans: hmmm... over lv9, huh. that's over halfway to lv20, the maximum. but don't think that means you're still 50-percent good. 50-percent, 20-percent. those are both still failing grades. besides. chances are... i've already tried to steer you in the right direction. so what can i say? what can i say that will change the mind of a being like you...?

LV 15 and over

[lSans: hmmm... over lv14, huh. well, hmmm... judgment-wise... you're a pretty bad person. you wander around, looking for people... killing them to take their money. that's just plain messed up. and what's worse, is that as bad as you are... you aren't anywhere near as bad as you could be. you pretty much suck at being evil. honestly, it's super embarrassing. but maybe you'd be better... at not killing anyone? crazy idea, huh? let me know how that one goes.

Dismissal (third judgment)

Sans: huh? you STILL looked bored. okay then, consider our session over.

No Mercy

Sans: heya. you've been busy, huh? ... so, i've got a question for ya. do you think even the worst person can change...? that everyone can be a good person, if they just try?
(Player takes a step forward.)
(Player takes another step forward.)
welp. sorry, old lady. this is why i never make promises.

    No Mercy Final Boss Fight 

our reports showed a massive anomaly in the timespace continuum. timelines jumping left and right, stopping and starting... until suddenly, everything ends. heh heh heh… that's your fault, isn't it? you can't understand how this feels, knowing that one day, without any warning... it's all going to be reset. look. i gave up trying to go back a long time ago. and getting to the surface doesn't really appeal anymore, either. cause even if we do... we'll just end up back here without any memory of it, right? to be blunt... it makes it kind of hard to give it my all. ...or is that just a poor excuse for being lazy...? hell if i know. all i know is... seeing what comes next... i can't afford not to care anymore.

ugh... that being said... you, uh, really like swinging that thing around, huh? ...listen. i know you didn't answer me before, but... somewhere in there. i can feel it. there's a glimmer of a good person inside of you. the memory of someone who once wanted to do the right thing. someone who, in another time, might have even been... a friend? c'mon, buddy. do you remember me? please, if you're listening... let's forget all of this, ok? just lay down your weapon and... well, my job will be a lot easier.

Player attacks again: welp, it was worth a shot. guess you like doing things the hard way, huh?

Player spares Sans: ... you're sparing me? finally. buddy. pal. i know how hard it must be... to make that choice. to go back on everything you've worked up to. i want you to know... i won't let it go to waste. ...c'mere, pal.
(Player is killed in an Unblockable Attack. Game Over screen shows up, set to a sped-up version of Dogsong.)
geeettttttt dunked on!!!
If you got dunked on: woah, you look REALLY pissed off... heheheh... did i getcha? well, if you came back anyway... i guess that means we never really WERE friends, huh? heh. don't tell that to the other sans-es, okay?

sounds strange, but before all this i was secretly hoping we could be friends. i always thought the anomaly was doing this cause they were unhappy. and when they got what they wanted, they would stop all this. and maybe all they needed was... i dunno. some good food, some bad laughs, some nice friends. but that's ridiculous, right? yeah, you're the type of person who won't EVER be happy. you'll keep consuming timelines over and over, until... well. hey. take it from me, kid. someday... you gotta learn when to QUIT. and that day's TODAY. cause... y'see... all this fighting is really tiring me out. and if you keep pushing me... then i'll be forced to use my special attack. yeah, my special attack. sound familiar? well, get ready. cause after the next move, i'm going to use it. so, if you don't want to see it, now would be a good time to die. well, here goes nothing... are you ready? survive THIS and i'll show you my special attack!"

huff... puff... all right. that's it. it's time for my special attack. are you ready? here goes nothing. yep. that's right. it's literally nothing. and it's not going to be anything, either.

heh heh heh... ya get it? i know i can't beat you. one of your turns... you're just gonna kill me. so, uh. i've decided... it's not gonna BE your turn. ever. i'm just gonna keep having MY turn until you give up. even if it means we have to stand here until the end of time. capiche? you'll get bored here. if you haven't gotten bored already, i mean. and then, you'll finally quit. i know your type. you're, uh, very determined, aren't you? you'll never give up, even if there's, uh... absolutely NO benefit to persevering whatsoever. if i can make that clear. no matter what, you'll just keep going. not out of any desire for good or evil... but just because you think you can. and because you can... you have to. but now, you've reached the end. there is nothing left for you now. so, uh, in my personal opinion... the most "determined" thing you can do here? is to, uh, completely give up. and... (yawn) do literally anything else.

heh, didja really think you would be able-

.... ... ... so... guess that's it, huh? ... just... don't say i didn't warn you.

welp. i'm going to grillby's. papyrus, do you want anything?

    Undyne in the No Mercy Route 
Pre-Speech Dialogue:

Monster kid: Undyne...
You're... You're hurt
Undyne:Hurt? It's nothing.
Next time, listen when I tell you to leave, okay?
Monster kid: Undyne... I...
Undyne: I'll take care of this! Get out of here!

heh... It's nothing... No... s-somehow, with just one hit... I'm already... Already... D... damn it...

Papyrus... Alphys... ASGORE... Just like that, I... I've failed you.

No... My body... It feels like it's splitting apart... Like any instant... I'll shatter in to a million pieces. But... Deep, deep in my soul. There is a burning feeling I can't describe. A burning feeling that WON'T let me die.

This isn't just about monsters anymore is it? If you get past me, you'll... Destroy them all won't you? Humans... Monsters... Everyone... Everyone's hopes. Everyone's dreams. Vanquished in an instant. But I WON'T let you do that.
Right now everyone in the world... I feel their hearts beating as one. And we all have ONE goal. To defeat YOU.

Human. No WHATEVER you are. I, UNDYNE will strike you down.

You're gonna have to try a little harder than THAT.


    Alphys Near-Genocide Ending, if No Mercy is aborted in Hotland before Mettaton NEO 

So... you're the one who killed all my friends. I just called to tell you, I hate you.

Yet... strangely... It's because of you, that... that I was forced to become a better person.

When I first saw you hurting people... I just sat there. Watching you. I felt so guilty knowing I hadn't do anything to stop you. I felt like all I do was... was hope you would destroy me, too.

But when Undyne called, with crazed desperation in her voice... I... I realized I had to do something. Even if it meant everybody would... have to learn the truth about me.

It's strange. You know? Even after all the bad things I did. People treated me like a hero. And then they... Asked me to run everything.

So I'm trying my best, here. I think I have some good policies, but, y-you know... Talking to people still makes me nervous. I'm no ASGORE, you know?

God... I miss everyone. Now that they're gone, feels so clear what I should have done. What I should have said.

Undyne... Asgore...


At least Sans is still here. He's... He's a good guy. And with him around...I...


You know. Just daydreaming here. But... I really should have killed you when I had the chance.

    Flowey, before the Neutral Final Boss Fight 

I owe you a HUGE thanks. You really did a number on that old fool. If it weren't for you, I NEVER could have gotten past him. But now, with YOUR help...he's DEAD. And I'VE got the human SOULS!

BOY! I've been empty for so long...It feels great to have a SOUL inside me again. Mmmm...I can feel them wriggling...

Awww, you're feeling left out, aren't you? Well, that's just perfect. After all, I only have six SOULS. I still need one more... before I become GOD. And then, with my newfound powers...monsters...humans...everyone...I'll show them all the REAL meaning of this world.

Oh, and forget about escaping to your old SAVE FILE. It's gone FOREVER. But don't worry, your old friend FLOWEY has worked out a replacement for you! I'll SAVE over your own death. So you can watch me tear you into bloody pieces, over...and over...and over.

What? Do you really think you can stop ME?

    Pre-Pacifist Final Boss 

"You IDIOTS! While you guys were having your little pow-wow... I took the human SOULS! And now, not only are THOSE under my power... But all of your FRIENDS' SOULS are gonna be mine, too! Hee hee hee.

"And you know what the best part is? It's all your fault. It's all because you MADE THEM love you. All the time you spent listening to them... encouraging them... caring about them... Without that, they wouldn't have come here. And now, with their souls and the humans' together... I will achieve my REAL FORM. Hee hee...

"Huh? WHY am I still doing this? Don't you get it? This is all just a GAME. If you leave the underground satisfied, you'll "win" the game. If you "win", you won't want to "play" with me anymore. And what would I do then?

"But this game between us will NEVER end. I'll hold victory in front of you, just within your reach... and then tear it away just before you grasp it. Over, and over, and over... Hee hee hee.

"Even if it means killing you 1,000,000 times!!!"

(Flowey starts pelting you with his Signature Move until you're down to 1 HP...but the last attack is deflected by Toriel's fire magic.)
Flowey: What?!
Toriel: Do not be afraid, my child... No matter what happens... We will always be there to protect you! (Player recovers one HP)
(Flowey's next round of attacks are deflected by a bone and a spear)
Papyrus: THAT'S RIGHT, HUMAN! YOU CAN WIN!! JUST DO WHAT I, WOULD DO...BELIEVE IN YOU! (player recovers another HP)
Undyne: Hey, human! If you got past ME, you can do ANYTHING! So don't worry. We're with you all the way! (player recovers another HP)
Sans: huh? you still haven't beaten this guy yet? come on, this weirdo's got nothin' on you. (player recovers another HP)
(Flowey's next round of attacks are deflected by fire and electricity.)
Flowey: D:<
Dr. Alphys: Technically, it's impossible for you to beat him... B-but somehow, I know you can do it!! (player recovers another HP)
Asgore: Human, for the future of humans and monsters...! You have to stay determined...! (player recovers another HP)
(player recovers all lost HP as Monster Kid, a Vulkin, Shyren, Snowy, Muffet, RG O1, a Froggit, and Greater Dog appear.)
Monster Kid: Come on, you got this!
Vulkin: We're with you, too!
Shyren: La la la la!
Muffet: You've GOT to win!
RG 01: You can do it!
Froggit: Ribbit.
Flowey: Urrrgh... NO! Unbelievable!! This can't be happening!! You...YOU...
(Flowey's expression suddenly turns nightmarish)
Flowey: I can't believe you're all so STUPID.
(Flowey starts absorbing everyone)

    Pacifist Final Boss Appears 

"Finally. I was so tired of being a flower." (turns to face the camera, slowly opens his eyes, smiling) "Howdy! [Player], are you there? It's me, your best friend!"


"You know, I don't care about destroying this world anymore. After I defeat you, and gain total control over the timeline...I just want to reset everything. All your progress...everyone's memories. I'll bring them all back to zero! Then we can do everything all over again! And you know what the best part is? You'll do it. And then you'll lose to me again, and again, and again!!! Because you want a "happy ending"! Because you "love your friends!" Because you "never give up"! Isn't that delicious? Your "determination, the power that let you get this far...It's gonna be your downfall!"

"Now, ENOUGH messing around! It's time to purge this timeline once and for all!"

"...even after that attack, you're still standing in my way...? really ARE something special. But don't get cocky. Up until now, I've only been using a fraction of my REAL power! Let's see what good your determination is against THIS!!"

    Pacifist Final Boss Fight 

"Urah ha ha... Behold my TRUE power! I can feel it... Every time you die, your grip on this world slips away. Every time you die, your friends forget you a little more. Your life will end here, in a world where no one remembers you..."

Still you're hanging on...? That's fine. In a few moments, you'll forget everything, too. That attitude will serve you well in your next life!"

"Ura ha ha... Still!? Come on... Show me what good your DETERMINATION is now!"

    End of Pacifist Final Boss Fight 

"Huh? What are you doing...? Wh... what did you do...? What's this feeling...? What's happening to me? No! NO! I don't need ANYONE! STOP IT! (Asriel blasts the player's SOUL with a barrage of spectral blasts)

❤ Save

Get away from me! Do you hear me!? I'll tear you apart! (Asriel's attack is much slower and weaker than before.)

❤ Save

... ... [Player]... Do you know why I'm doing this...? Why I keep fighting to keep you around...? (He tries using fire magic, but just like Toriel in the RUINS, the fireballs will never touch the player's SOUL)

❤ Save

I'm doing this... Because you're special, [Player]. You're the only one that understands me. You're the only one who's any fun to play with anymore.

❤ Save

... No... That's not JUST it. I... I... I'm doing this because I care about you, [Player]! I care about you more than anybody else!

❤ Save

I'm not ready for this to end. I'm not ready for you to leave. I'm not ready to say goodbye to someone like you again...

❤ Save

So, please... STOP doing this... AND JUST LET ME WIN!!! (Asriel now blasts the player's SOUL point blank with a massive prismatic Death Ray) STOP IT! (The player's menu options are destroyed except for the SAVE button, while their health ticks deeper into the decimal places...) STOP IT NOW!!! (...until the player is left with one ten-billionth of a hit point)

❤ Save


❤ Save

I'm so alone, [Player]...

❤ Save

I'm so afraid, [Player]...

❤ Save


❤ Save


    Pacifist Final Boss Epilogue Dialogue 

Asriel: Do not worry about me. Someone has to take care of these flowers.

Asriel: Frisk, please leave me alone. I can't come back. I just can't, OK?

Asriel: I don't want to break their hearts all over again. It's better if they never see me.

Asriel: ... why are you still here? Are you trying to keep me company? Frisk... ... Hey. Let me ask you a question. Frisk... Why did you come here? Everyone knows the legend, right...? "Travellers who climb Mt. Ebott are said to disappear." ... Frisk. Why would you ever climb a mountain like that? Was it foolishness? Was it fate? Or was it... Because you...? Well. Only you know the answer, don't you...?

Asriel: I know why [Player] climbed the mountain. It wasn't for a very happy reason. Frisk. I'll be honest with you. [Player] hated humanity. Why they did, they never talked about it. But they felt very strongly about that.

Asriel: Frisk... You really ARE different from [Player]. In fact, though you have similar, uh, fashion choices... I don't know why I ever acted like you were the same person. Maybe... The truth is... [Player] wasn't really the greatest person. While, Frisk... You're the type of friend I wish I always had. So maybe I was kind of projecting a little bit. Let's be honest. I did some weird stuff as a flower.

Asriel: There's one last thing I feel like I should tell you. Frisk, when [Player] and I combined our SOULs together... The control over our body was actually split between us. They were the one that picked up their own empty body. And then, when we got to the village... They were the one that wanted to... ... to use our full power. I was the one that resisted. And then, because of me, we... Well, that's why I ended up a flower. This whole time, I've blamed myself for that decision. That's why I adopted that horrible view of the world. "Kill or be killed." But now... After meeting you... Frisk, I don't regret that decision anymore. I did the right thing. If I killed those humans... We would have had to wage war against all of humanity. And in the end, everyone went free, right? I still feel kind of sad knowing how long it took... ... so maybe it wasn't a perfect decision. But you can't regret hard choices your whole life, right? Well, not that I have much of a life left. But that's besides the point.

Asriel: Frisk, thank you for listening to me. You should really go be with your friends now, OK? Oh, and, please... In the future, if you uh, see me... Don't think of it as me, OK? I just want you to remember me like this. Someone that was your friend for a little while. Oh, and Frisk... Be careful in the outside world, OK? Despite what everyone thinks, it's not as nice as it is here. There are a lot of Floweys out there. And not everything can be resolved by just being nice. Don't kill, and don't be killed, alright? That's the best you can strive for. Well, see you.

    Sans's post-neutral ending phone calls 

heya. is anyone there...? well, i'll just leave a message...

Everyone is deadnote 

it's been a while, huh? ... things have gotten pretty bad here. everyone considered a leader disappeared overnight. it's gotten so quiet. there's a bad feeling hanging over everyone. like everyone's just going to die here, trapped in the dark... i bet you're wondering why i'm not the ruler. eh. i'm not cut out for something like that. i like to take it easy, you know? ... that's a joke. this is what happens when people like me take it easy. ... hey, at least things are less crowded. 'cause of all the people you killed. hope that was a good experience for you. ... just kidding. i don't really hope that. go to hell.

Everyone livesnote 

Sans: so, it's been a while. the queen has returned, and is now ruling over the underground. she's instated a new policy...all the humans who fall down here will be treated not as enemies...but as friends. it's probably for the best anyway. the human souls the king gathered...seem to have disappeared. so, uh, that plan ain't happening any time soon. but even though people are heartbroken over the king, and things are looking grim for our freedom, the queen's trying her best not to let us give up hope. so, uh, hey...if we're not giving up down here, don't give up wherever you are, ok? who know's how long it'll take. but we will get out of here. that's a promise.
Sans: oh, nobody.
Sans: here, knock yourself out.
Undyne: Hey! What are you up to, punk?!
Undyne: Hey! Who's in charge here?!
Papyrus: ME.
Undyne: Oh...yeah, that's right! I quit my job as leader of the Royal Guard. Actually, since we won't be doing any fighting anymore, the Royal Guard totally disbanded. There's only one member now.
Undyne: Yeah! He is! C'mere!
Undyne: Anyway, now that I'm working as Alphys' lab assistant, we're gonna find a way out of this dump once and for all! Oh yeah, I'm a gym teacher at the queen's new school. Did you know I can bench-press seven children?! Awesome, right! ... Hey. I'm sorry about what happened with Asgore. You were just doing what you had to do. It's not your fault he... ... Aw, darn it. I miss the big guy...
Alphys: H-hey, Undyne? Are you okay...?
Undyne: I'm fine. Why don't you talk for a while?
Alphys: U...uh, okay! Man, she's tsundere. ... ... Um, I really don't like talking on the phone. I really don't know what to say. ... Hey, why didn't you tell me the queen was so cute? Uh, I mean, uh...Mettaton's doing OK! And! Um! I'm trying to find a way to get us out of here! B-but I kinda have no idea what I'm doing. I'll figure it out eventually, though. The queen is a lot different from Asgore...she actually checks to see if I'm doing anything. She's really turned this place around! ... Oh! Hey! Do you want to talk to...? ... Well, she says she's busy.
Undyne: Okay, she SAYS she's busy.
Sans: we wouldn't get the phone back for a couple of hours.
Alphys: B-but if you want to, call and talk to her any time.
Undyne: Yeah! She's be happy to hear from ya!
Sans: oh, whoops, this thing's almost out of batteries. so, hate to cut this short, seeing you, ok, buddy?
Undyne: See ya, punk!
Alphys: G-good...good...hey, why do I have to be the one to hang up? Eheheh...I hate goodbyes...Um, we'll see you again someday!

Dog endingnote 

it's been a while, huh? ... it seems a number of important people disappeared overnight. but no one else was harmed. the people were confused. it was complete bedlam. somehow, at the end of the day... a small, white dog became president of the underground. it sleeps on the throne and does absolutely nothing. strangely, it seems this is the best life for everyone. thanks.

    Genocide/No Mercy Ending Speech 

First Encounter

Greetings. I am [Player].

Thank you. Your power awakened me from death. My "human soul." My "determination." They were not mine, but YOURS. At first, I was so confused. Our plan had failed, hadn't it? Why was I brought back to life?



With your guidance, I realized the purpose of my reincarnation.


Together, we eradicated the enemy and became strong. HP. ATK. DEF. GOLD. EXP. LV. Every time a number increases, that feeling... That's me. "[Playername]."

Now. Now, we have reached the absolute. There is nothing left for us here. Let us erase this pointless world, and move on to the next.


Right. You are a great partner. We'll be together forever, won't we?

Do Not

No...? Hm... How curious. You must have misunderstood.

When the player opens the game after completing a No Mercy run. After 10 minutes...

Interesting. You want to go back. You want to go back to the world you destroyed. It was you who pushed everything to its edge. It was you who led the world to its destruction. But you cannot accept it. You think you are above consequences.




Then what are you looking for?

Perhaps. We can reach a compromise. You still have something I want. Give it to me. And I will bring this world back.


Then it is agreed. You will give me your SOUL.


...Then, it is done.


Then stay here for all eternity.

Subsequential Encounters

Greetings. I am [Player].

"[Player]." The demon that comes when people call its name. It doesn't matter when. It doesn't matter where. Time after time, I will appear. And, with your help, we will eradicate the enemy and become strong. HP. ATK. DEF. GOLD. EXP. LV. Every time a number increases, that feeling... That's me. "[Playername]."


But, you and I are not the same, are we? This SOUL resonates with a strange feeling. There is a reason you continue to recreate this world. There is a reason you continue to destroy it. You. You are wracked with a perverted sentimentality.

Hmm. I cannot understand these feelings any more. Despite this, I feel obligated to suggest. Should you choose to create this world once more, another path would be better suited.

Now, partner, let us send this world back into the abyss.


Right. You are a great partner. We'll be together forever, won't we?

Do Not


Hmm... This feeling you have. This is what I spoke of. Unfortunately, regarding this...

Unmarked spoilers end here.

    Snippets from the game's files 
There is unused text from a book in the library which perfectly explains what "Fallen Down" means.

Unfortunately, monsters are not experienced with illness. However, when monsters are about to expire of age, they lie down, immobile. We call this state "Fallen Down." A person who has Fallen Down will soon perish.
Unused book

In Patch v1.001, the opening lines of the file storing all of the game's text were changed dramatically. The change is... interesting, to say the least.

Before patch

Part of this game's charm is the mystery of how many options or secrets there are. If you are reading this, please don't post this message or this information anywhere. Or doing secrets will become pointless.
By the way, most of the seemingly unused text/files are used.
If you can find the in-game context for an asset, you can show it off. But if you can't, it probably means you haven't looked hard enough. Anything truly unused I'll probably post myself, later.
Living in a world like this, where people can simply cheat out the answers from the code... your impatience has REALLY damaged you, hasn't it?
After patch
You have made yourself completely clear.
I, your humble servant, will follow you to the utmost...

In the game's files, there is a sound file named abc_123_a.ogg. This consists of various TTS voices speaking to the person who opened the file. This, too, was changed after v1.001 and the change is also interesting.

Before patch

Hello. H-h-h-h-have some respect and don't spoil the game.
It's impossible to have mysteries nowadays...
...because of nosy people like you.
Please, keep all of this between us.
If you post it online, I won't make any more secrets.
It will beeeee yooooour faaaaaault.

After the patch, the file was changed to a 10-second clip of various TTS voices creepily laughing.

    W.D. Gaster, his followers and Goners 

Have you ever thought about a world where everything is the same... except you don't exist? Everything functions perfectly without you. Ha, ha... the thought terrifies me. [...] Please forget about me.
— "Goner Kid"

Alphys might work faster. But the old Royal Scientist, W.D. Gaster? One day, he vanished without a trace. They say he shattered across time and space. Ha ha... how can I say so without fear? I'm holding a piece of him right here.

It makes sense why ASGORE took so long to hire a new royal scientist. After all, the old one... Dr. Gaster. What an act to follow!
They say he created the CORE. However, his life... was cut short. One day, he fell into his creation, and...
Will Alphys end up the same way?

I understand why ASGORE took so long to hire a new royal scientist. The previous one... Dr. Gaster. His brilliance was irreplaceable.
However, his life... was cut short. One day, his experiments went wrong, and...
...Well, I needn't gossip. After all, it's rude to talk about someone who's listening.
— The Gaster followers

So you never met my neighbor's daughter.
But please don't despair.
Because the time that you will meet her...
* ... is fast approaching.note 
— The Clam Girl, post-Switch update


    Others' reactions to Undertale 

"I've seen people compare Undertale to EarthBound, and it's a very apt comparison. It's an RPG with a similarly fantastic sense of humor, in everything from the character dialogue, battle text, item descriptions, and spritework. It's endlessly charming, and it's nearly impossible not to crack a smile while playing."
Ben Davis, Destructoid, on Undertale Review

"Although it has been in the making for some time, now it finally has its full release and it sure is receiving a lot of praise, some even billing it as the best game ever!"
Adam Singleton, Rocky Bytes, on Undertale

"Undertale is a game about loneliness. The game takes place in a fragmented world. Monsters have been forcefully sequestered into what amounts to a hole in the ground known as “Monster World."
Nathan Grayson, Kotaku, on Undertale: The Kotaku Review

"Undertale is a good game."
Yahtzee Croshaw's review of Undertale, reprinted here in its entirety.

"Man, feels so good. Still... he's still my buddy in the end. Whaaaat the fuck?! Get dunked on?! I have to do that again?! You lied to me! You lied to me...!"
Joel gets dunked on.

Joel again, after getting dunked.

"This game makes you feel like a scumbag."
videogamedunkey in his Dundertale video (in reaction to killing the game's Battle Couple)

I've played a lot of RPGs over the years; about three of those were good. Undertale joins that small group. It does this bizarre thing where you actually like the characters and you don't want them all to die in a car fire.note 

There comes a time in every gamer's life that they just have to take a minute—they just have to take a minute, step back, and...realize what has just happened. I JUST GOT DUNKED ON BY A FONT.
Admiral Bahroo, after he gets dunked on by sans.

This is too fun! This is so great! That is unlike everything I have ever seen! That is so cool! I have to keep playing this, I just have to! Lets do this!
OH! You tricked me! You sonovabitch Sans, you sonovabitch!
Goddamn this guy! Goddamn this guy! GODDAMN this guy! I can't believe how hard this is! This is insane!
Why is there a bone coming constantly from the left? What's hap- OOH YOU SONOVABITCH!!
What?! WHAT?! WHAT?! NO! HOLY SHIT! How is he doing this?! This is unreal!
This is hard to react... Oh! OH YOU SONOVABITCH HOW ARE YOU DOING THAT?!
Zero, underestimating the Final Boss of No Mercy route.