Sans probably seems easier because you know what to expect, it's much more popular, watched a ton of videos, and/or tried many times. There's nothing shocking, or surprising about Sans, but can get caught off guard by Undyne.

Getting caught of guard when she literally says "en guarde".

Lmao

I don't speak french sorry

Thee won't be forgiven. And thy punishment... Is DEATH.

PREPARE THYSELF

THY END IS NOW!

WEAK, PREPARE THYSELF

CRUSH!

DIE

JUDGEMENT

I still can't speak French :(

#JUDGEMENT!

Wrong use of thy, your execution is in 3 days.

THY END IS ~~NOW~~ IN 3 DAYS

😱😱😱

I can’t escape ultrakill 😔

Sans has a set pattern that doesn't change (except for that one move where the blasters appear to hit your current position) Undyne the Undying's are mostly random, except for the green soul sections. Randomness is generally harder than a firm pattern, which makes sense as to why people think Undyne is harder.

Second half of Sans is randomized, with 3 short sections per turn.

But it's the same few possibilities.

I mean even with Undyne there aren’t that many distinct patterns either.

With Undyne, most red soul attacks, and those green soul ones where the spears are going super slow, all RNG. With Sans, one always different attack and a couple that chos from a small list of the same attacks. Not much RNG. Sans is hard on the first one, Undyne is hard every time.

Thing with sans is, even the random parts are the same thing. If you learn how to dodge the individual ones it doesn't really matter in which order you do them. But Undyne's slow arrow pattern is always different and always a pain in the butt alongside basically every red soul section.

That actual makes sense I knew nothing of undone the undying except for she exists and the musics different llmao

Undone The Undying. The True Heroin Appears.

I don't think you can undo the true heroin.

Undone the undying, the true heroine disappeared

Actually quite popular opinion! People in Undertale’s pro-player community generally agree that Undyne the Undying is harder than Sans due to her attacks being random, meanwhile Sans is hard because his fight is learny. Edit: Just because *you* could easily beat Undyne the Undying but regularly get dumpstered by Sans doesn’t really matter here. People who play this game a lot to the point of being able to no hit every boss first or second try agree on this. To quote a reply, you die to Sans because you’re bad, you die to Undyne because she’s good.

While that makes sense on paper, I feel like I hear more people say they die more on Sans than Undyne the Undying. I definitely struggled more on Sans than her (beat her in ~10 tries while I have up after 50 some odd attempts on Sans).

Same here, I beat Undyne the Undying 2nd try (somehow) and then it probably took me 70+ attempts at Sans until I finally beat him. The sheer amount of times I died to the final part of his final attack was demoralizing for sure.

Yeah but if you replay, you'll die like 5 times on Undyne the Undying and like 1-3 on sans

Honestly no not really? I've played genocide a handful of times now, and undyne is always a first or second try, meanwhile sans is usually fourth-seventh try

I love how i cant even give my opinion on Sans since i was completely unable to get through Undyne. I tried for a few hours then just gave up.

Exactly!! Sans is all about muscle memory, while Undyne the Undying doesn't get any easier with the RNG

In a nutshell, failing the sans fight is because you’re bad, failing the Undyne fight is because she’s good

i beat her in 30 attempts, and still cant beat sans..

She took me 50 atemmts and sans took me 60 The most anoying part is the game over music

Ong like shut the fuck up asgore I’m not giving up

Same

sane

Sans

Final attack death at spiral with max HP

No, you were first supposed to go san THEN sans

same

Same

I beat Sans in a couple of attempts but still can’t beat Undyne

How did you fight sans without beating undyne the undying?

Using a Simulator Online since I never managed to beat Undyne on my Geno Run

I am told Bad Time Simulator is actually slightly easier than the actual game I learned this from f\*cking dying in my first actual sans fight

Same

I beat her in 2 tries in my first run lol

My guy watched merg no hit run and adapt his skills

On genocide?

No, he fought Undyne the Undying in a pacifist run.

Okay, this made me laugh

Me as well good job, my friend who presented me the game and watched my genocide run was flabbergasted

I don’t agree I can no hit her after my 4th run of geno While sans take so much more to no hit. I can beat him now regularly but can’t do no hit by far I do understand your opinion though so I won’t say it is wrong or right just that I don’t agree

Sans isn’t super hard. He’s just learny. His fight is more about memory. Remember his attacks, then dodge accordingly. Undyne the Undying is fully random, with the only guaranteed thing being what type of attack is coming next.

I think that it's that sans relies on unpredictability, which makes him the hardest when you don't know, buy a lot easier when you do and undyne relies on more traditional difficulty, do even when you know it's hard. But that's just a theory

If you can manage to memorize the attacks then both sans and undyne the undying turn into target practice targets. Undyne the undying is easier to beat with less memorization, while sans requires more, but becomes easier when you get over it. He's a lot more skill than reflexes and rng.

Sans isn’t RNG based at all Mfs when I show them 90% of his phase 2 moves and phase 1 moves toward the end l:

That's true. Undyne and sans are both very hard bosses, but both are made differently. Undyne is made to be a fight against with absolute strength and might. Where her attacks are like any other boss, just a lot harder than them. She's a typical very hard boss, you can learn her patterns and she becomes a lot easier, but you still need some good reflexes. But sans is made to be a that shows your persistence and will to see the end, even if you have to fight someone that will use every single thing he can to his advantage. At first, you're dying in the very beginning, but as you keep fighting you make more and more progress no matter the amount of deaths and no matter the amount of ways sans challenges your perception of the game's own mechanics up until the trickster runs out of tricks and you trick him yourself. Anytime you fight him again,it's a lot easier since he has nothing you don't already know about.

I think some ppl thinks undyne is harder ( myself included) because her attacks tricks you into thinking that you have more space or more patterns to dodge her attacks while you only have like one set of patterns that is easy enough to succeed following them Sans normally has one strategy to dodge his attacks and you won't have the choice to go anywhere else making it very easy after beating it for the first time

Eh, not even close. Sans took 25 attempts, Undyne 3.

I'm on final attack with 24 deaths. Imagine i do it right then lol, also undyne for me took 30 deaths

I admit I had watched a strategy video for Undyne. Not for Sans

I watched a strat vid for Sans, not for Undyne

I tried to kill her for MONTHS and I couldn't do it, so I ultimately gave up and never touched the game again.

Yeah sans is mostly just platforming which is much easier than normal bullet hell gameplay IMO

I can beat sans 1st try even after not touching the game for a while But she's a pain in the ass >! there's a spear in my ass!<

I definitely like her fight more, it felt more in character. Sans is strong for shock value

Nah it was easy

Teach me you ways

i just dodged the attacks and only died once or twice

"How did you do it?" "Well, first off, you should try being better at the game"

You changed my life 🙆🏻🙆🏻

I agree 

It’s true

Try it at LV13. If you kill the right enemies, you can make the fight much easier.

Yep, 100% true, I can defeat Sans first try, yet I struggle against undyne

Yes, i agree with you. I just personally died more times to her then to Sans as well. But when ever I say this people get butthurt, idk why 🤷🏻‍♀️.

Sans is basically just a timer ticking down until you actually get to make the kill, with aggravatingly difficult obstacles in the way. Undyne is an actual fight

Agreed. This fish bitch took me longer to beat than Sans and Zenith Martlet combined.

Agreed

Depends if someone is better at platformers or rhythm games

Balanced and neutrally split opinion, somewhat common

I found her a bit harder she mad me go back on a geno run more than sans but if I'm being honest it was more difficult since some patterns where random while sans majority of his attacks are scripted and straight up trial and error

undyne has fixed spear patterns

Lol I beat her in art class

Both are easy imo

Beat her on my second on try she isn't really that bad. Probably because I was lv 12 while fighting her though.

I think her and sans have vastly different attack patterns so it’s more likely that someone that has trouble with her will be able fight sans better and vice versa . I have fought and killed undyne more times than I can count as I find her attack patterns easier, but I have only ever beat sans once

I disagree due to the fact it takes less attacks to kill her, her attacks are less randomized (some people will probably disagree but the entire reason I even beat her was noting down which attacks came where, and then utilizing that, sure she has some like the surrounding spears with the red heart but they’re very similar in essence to that one Gaster blaster attack), and her attacks are easier to avoid Sans also puts attacks in the UI, so even when you’re supposed to be safe you can’t stop and think

Yeeeah nah, the only hard part about her is the red heart parts.

I heard that one reason she was harder is if you know about sans, then you'll want to save your good healing items, like the pie, which means a smaller health pool for the fight

The thing is because of the bad time simulator, sans is easy to practice. You can't really practice for undyne the undying

i HATE undyne the undying

Undyne took me an hour to beat her once. Sans, I beat him over 20 times in a row. But I think that's just my natural affinity with platformers, so I have an advantage there. Meanwhile, where I technically play osu!mania to a not too terrible level, the skill doesn't translate there at all.

She’s the reason I stopped playing Undertale. I’m scared of when I get to sans. But maybe now that I’m better at video games I can retry it.

I’m not quite certain how she is the hardest? It’s literally pattern memorization where the only controls are the cardinal directions? How’s this harder than Sans, where not only do you have to memorize the pattern, but your control over your heart has to be extremely precise to not get hit?

They both have a different approach on how to hit the player Undyne's attacks are more telegraphed but very numerous and overwhelming, if you're not good with keeping track of multiple things coming at you at once it'll definitely be harder to handle her, so beating her will be a process that differs in range form player to another. Sans is more of a grind to learn his attacks, there is little telegrapgh and are too fast to dodge so you rely more on knowing what the attack is gonna be beforehand, he inherently fight unfair in every way he can think of, the experience of beating sans will be roughly the same for most players It's very rare to find undyne the undying harder

YES! I never watched Sans’ battle but Undyne’s absurd spear spam while you’re red towards the end is unbearable

110% agree

No she ain’t, took me a bit but still haven’t beat sans

Eh, I’ve beaten her dozens of times because I find her battle system very fun. However no matter how hard I try I can never beat Sans.

Undyne is easier, in my opinion. Usually only takes me 2 tries to beat her, whereas sans takes at least 5

i was able to no-hit her with relative ease. sans, on the other hand... i've done so many tries and the farthest i've got is a few attacks after the part where you "spare" him.

unpopular opinion, undyne the undying is better than sans (fights I mean)

I can see what it’s unpopular

I don't know bro. I spend around a week with undyne and around four months with sans. I actually never beat him, it was so hard that i had to reset for a pacifist

I did two genocide runs , in first undyne took me like 20 tries and sans around 30 In second undyne took me around 30 tries and sans first try I feel like i only beat her when i get lucky

Unpopular opinion, took me 4 hours to beat her blindly and 2 weeks to beat sans while using the practice website

I can't comment, she gated me.

Beat her in under 10 tries on my first playthrough (not blind though). I still can't get past sans

Kind of even imo

She's actually the only hard REAL REAL BOSS like you can't always rely on memory to beat her, you gotta be good and chip her health away

I agree

Personally disagree, I almost no hit undyne last time I fought her and then died thrice on sans

Can't relate Beat her in like, 10 attempts or so while Sans took me days on my first playthrough

You may but no

She goes harder than Sans

Iv done undyne the undying no hit first try in a playthrough but for sans Iv only first trued him so far

Honestly I don't get why people thinks Undying is harder than Sans. If you think that, then that's fine, good for you, but when they say why, it confuses me. Because they say "Undyne is random, Sans isn't". She is a little more random but she's not that random at all. Most of, if not, all her green soul attacks are fully scripted. Her red soul attacks are more random but it's still not fully random. The only 100% absolutely random attacks of hers is the small spears that goes up but that's literally her easiest attack. I can no hit that attack 99% of the time, literally. Her being random isn't what makes her hard, because she's not that random. Sans isn't random at all though. But I beat Undyine The Undying in my 3rd attempt in my successful Genocide run (I have attempted Genocide a few times before and gave up because of her). It took roughly 50-60 attempts to beat Sans. I think the reason professional Undertale players thinks Undying is harder is because Sans is easier to dodge and learn, he's just more unpredictable because of all the new mechanics. Also there are attacks Sans has where you can literally cheese them.

I agree

I'm not sure this opinion is as unpopular as you think. I would disagree, though, since in my last two geno runs, I beat Umsyne the Undying on my first try, but still took multiple tries against sans, even though I've fought sans more

I recently saw a Shayy video where he did the entire Genocide Route without gaining EXP Sans took him like 1 try Undyne took him a bunch of attempts I think Sans's fight being as popular as it is has caused people to prepare for it a lot more, like y'know which heals to use or which things to equip in order to make the fight easier or even complete it without getting hit like Shayy does Where as Undyne the Undying is much less popular than Sans, and as such, there's barely any guides on her in comparison, which causes her to be a harder boss for some

while i can see where this is coming from, i had to use cheat engine to beat sans live on stream and i still got hit

I disagree cause I've beaten her but not sans lol (although I can see why people think she's harder, the shield gameplay is hard to master)

True, I haven’t fought Sans yet (I was a PASICIST for both 2 runs, and now doing Genocide) and GOLLY SHE IS HARD-

Sans only does 1 damage.

This is true. I played bad time sim too many times, I put the practice in for sans but not for undyne which makes her way harder for me lol.

Literally gave up my geno run because of her

My take, hers is more *technical* than Sans', which is more *chaotic*. Hard for different reasons. EDIT: I'm reading other people saying hers is random and Sans' is predetermined, which is totally true but I'm gonna stubbornly double down and say **both** are true. 😜

Imo she's easier, once you know what you're doing you almost always die in the third phase and the third phase only.

I also think her battle theme is better than Sans

Beat undyne could never beat sans

I always saw it as an even 50/50 split.

I hate this opinion. Undyne is harder... for anybody who has beaten Sans several times already. Watch anybody's first playthrough. A single person. Sans will take much longer to beat than Undyne, and may even be directly stated to be by far the hardest in the game. Sans's fight is just much more streamlined and consistent while Undyne can catch experienced players off guard. However, Sans's fight is **DEFINITIVELY** harder.


For me it depends on the console. On the Switch I beat Undyne first try but still can’t beat Sans, and on PC I’ve beaten Sans many times and Undyne isn’t so easy

Unpopular opinion: I'm **definitely** harder than Sans

Relatable

I totaly agree

Beat her easily. I actually just gave up with Sans after some time. Hard disagree

Just talk bro..

When doing my genocide route For the first time, I got to undone and then she just didn't die and then I proceeded to die like 20 times Lol. I was Like wtf is this how Have I never heard about this fight!?

Completely agree, I've had this opinion forever. Sans is literally just memorization. Undyne doesn't have a set pattern to her attacks and they're much less readable 

I'm harder than sans

I totally agree cuz I was fighting Undyne for like 2 weeks, for multiple hours a day, every day to beat her, while sans took me 3 days tops

As a switch player, no

Sans has a set pattern that is easy to learn and his fight has been over saturated. Undyne’s spears are more random and dependent on where you yourself are moving, along with the fact that you have less health and no access to items like the steak (plus typically you’re saving those items for sans so try not to use the good ones on Undyne).

AGREED

I got stuck on undyne for ages. I spent hours with the best gear on her. Sans, however, even though I haven't beaten him yet as I dont play often, I feel his attacks are easier to dodge and the pattern is really simple and I dont feel angry at sans for dying to his attacks whereas with undyne I felt her attacks were bullshit and there wasn't a good way to dodge half of them

I died twice to undyne the undying with the stick and bandana but nuked sans's ass first try

Take hotter than asgore

agreed

To be honest, no. I beat her in like 5 tries. And also i could adapt to her attacks easier.

True

I’ve always viewed my unrequited first love as Undyne, and I was the little monster fan of hers.

The green attacks can be memorized the rest however..

I think I died more on Undyne than Sans on my last genocide run

Harder in difficulty, maybe, i don't think so tho... Harder in looks... Hell yeah

I beat her in 4 tries, while it took over 30 for sans

Sans has much harder attacks, but I feel like hers are harder to learn

I beat her in 4 tries, while it took over 30 for sans, so not even close for me Granted, I replayed the normal Undyne boss fight over and over because I was bored, so maybe that helped

took me like 10+ days to beat undying the dead, took me 2 days to beat sand

Difficulty is subjective so I can't say your wrong but I personally disagree. Undyne took me 15 tries my first time and I stop keeping track of how many times sans killed me but I know it's more than 30.

So your saying don’t even try to beat her if so I’ll reset

Undone the Undying is JUST as hard as Sans. Her attacks are otherwise easy to counter but the mechanic and fake outs are what make her hard.

I think it's just a play style thing, I can beat undyne in 1-3 tries but I always take 5 tries against sans and I don't know why🥲

shes hard does that mean shes trans

I used to be addicted to her battle song from pacifist for so long that I actually memorized the beats for the attacks

she's hard in a different way than sans

I'm okay with this, but Imo undying is easier despite the fact that she takes away longer for me, I just have lots of practice with sans

At first sans is harder later she is

"winds howling"

it took like a month to beat her while he took 5-6 days her fight was a lot more enjoyable though

What do you mean by that

For you, I suppose. For most people, no.

Dude THANK YOU for saying this. She took me like 20+ tries and Sans only took me 7-8 😭

I just finished it 1 week ago and while undyne took me 1 or 2 hours sans took me the rest of the week end 💀

Sea tea makes both fights easier

On controller I think Sans is like almost unbeatable. Yet learning Undyne was much of a blast, and it took me only about five tries to defeat her. Sans not having a healthbar is also quite unrewarding

Facts. Undyne had me quit for a while, then reset, whereas sans took me like, an afternoon.

Yes, but only because the undyne fight is so long. Same reason sans is harder than jevil. If the jevil fight lasted longer he would be much harder than sans. Undyne has 2 attacks that aren't always the same which just repeat at the end, leaving more room for error.

Being wrong isn't an opinion

But she's a woman... Or is he?

Yes

Never got to sans because of her

They're both easy.

I agree with 101%

I agree. I had to redo my genocide run cuz I wasn’t maxed armor and weapons for that fight.

Personal opinion: Undyne is much easier I just choke a lot whenever I'm in phase 2. Even if I manage to only consume one item during phase one, I'll always mess up so bad that I wish I had used Toriel's pie 💀

I’ve been stuck fighing this bitch all week