In Undertale’s grueling genocide route, Sans, the pun-loving skeleton, faces you in the game’s toughest boss fight. His dialogue transforms from witty quips to haunting reflections on time, choice, and morality. This guide compiles every word Sans speaks, capturing the weight of his final stand in the Last Corridor.

Before the Fight: A Final Question

You stride through the golden Last Corridor, where Sans’ silhouette looms.

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?
heh heh heh heh…
all right.
well, here’s a better question.
do you wanna have a bad time?
'cause if you take another step forward…
you are really not going to like what happens next.
welp.
sorry, old lady.
this is why i never make promises.

Battle Begins: A Burning Verdict

Sans unleashes his fury with an iconic opener:

it’s a beautiful day outside.
birds are singing, flowers are blooming…
on days like these, kids like you…
should be burning in hell.

Confronting Timelines: Early Battle

As you dodge his relentless attacks, Sans exposes his knowledge of your actions:

what? you think i’m just gonna stand there and take it?

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 right 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.

Pleading for Mercy: Mid-Battle Shift

After surviving his onslaught, Sans offers a glimmer of hope:

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 this, ok?
just lay down your weapon, and…
well, my job will be a lot easier.

If you choose to spare him:

… 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’mon, pal.

If you fall for his trap:

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

Last Stand: Exhaustion and Defiance

As Sans tires, his words grow introspective:

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.

Sans prepares his ultimate strategy:

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!

The Special Attack: Stalling Eternity

Sans unveils his final gambit—a refusal to let you act:

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.

Final Words: A Farewell to Papyrus

When you land the fatal blow:

heh, didja really think you would be able to-

As Sans stumbles off-screen, bleeding and broken:

… … …
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?

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Relive Sans’ heart-wrenching dialogue and test your skills in the Bad Time Simulator, a perfect way to experience this iconic battle without replaying the genocide route. Let Sans’ words linger as you reflect on Undertale’s themes of choice and consequence.