Underfell Sans Boss Fight | Deltatraveler [ DELTARUNE/UNDERTALE FAN GAME ]

(Spoiler warning: if you want to know why are we in this situation, go play the game yourself. You won't regret it! or well... watch my full playthrough if you don't want to.)
This is an amazing fan-game fight that actually took me a few attempts! honestly this just gets me more excited for whats to come next in this fan-game! (Genocide/Obliteration route soon)
Get the game here!:
gamejolt.com/g...
Creator:
/ vyletbunni
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- Fan-Game description:
Kris and Susie (Deltarune) suddenly wake up on a flower bed in the world of Undertale. They, along with Noelle, must travel between different worlds to make their way back home.
This is an Undertale fangame that combines elements of Deltarune to create an interesting experience, both in gameplay and in story. If you haven't played either before, I'd highly recommend either playing them or watch videos on them before playing this. Heck, Deltarune Chapters 1 and 2 are free!
#undertale #deltarune #fangame

[@xsl]

*FULL DELTATRAVELER V3 PLAYTHROUGH* : kzbin.info/www/bejne/d3LdmIyfoJl1jqs *PLAY HERE* : gamejolt.com/games/deltatraveler/661464

[@malktheyateagrape.376]

I do like the small detail of the sweat marks on sans’ head being the amount of turns left of him being distracted

[@funkymonkey7252]

i just noticed that, that’s cool

[@moltengears7483]

well that would have been helpful to know 20 mins ago

[@gibustheinfamous]

So THAT'S how you know if hes distracted when you're later into the fight.

[@TehLoracs]

Nobody says how fucked up this sans really is. He killed a fucking orphan, for no reason.

[@whocaresaboutthename6850]

He actually did it bc she was that world Susie who he hates along Kris, Noelle etc for some reason

[@TehLoracs]

@@whocaresaboutthename6850 still though, you have to admit it's fucked up

[@whocaresaboutthename6850]

@@TehLoracs no shit, i just said he had a reason bruh

[@Bongetta]

I mean who wouldn't who's the orphan gonna tell? Their parents?

[@whocaresaboutthename6850]

@@Bongetta Ofc, when they reach hell/heaven

[@the_bookworm8281]

I like how Underfell Sans' final laser circle gives off the illusion of being more insane than normal Sans laser circle due to there being far more lasers involved, aka what you would expect from the "Undertale fangame" stereotype. However due to how close each blaster is to eachother, the actual circle itself moves at a far slower speed than the normal Sans laser circle, making it ironically much easier to deal with than the one from Undertale. This is a genius design decision from the developers for many different reasons.

[@jambunboii4537]

Makes come off as that bit more nuts while keeping it reasonably doable to the average player

[@MyUsernameIsGoofy]

I think it's more of a "Congratulations, you won" type of attack, like it's easy but flashy enough to think you're about to die.

[@multigrandmarquis]

exactly. he's overdoing it to his own detriment. sans in undertale is cool and calculated while fighting you, and this is just blind bloodlust.

[@sfsd_]

what make this battle more interesting then any other sans battle is the fact that sans is the one to push the fight idea on you and not you

[@skell6134]

@@Thorbrine Not really,pretty sure he dodges entire fight if you fight him on Obliteration route

[@Kanny64]

​@@skell6134 he only dodges when fully focused That's why people use distract because he doesn't get tired

[@skell6134]

@@Kanny64 Ok then,i just thought he aint getting distracted on obliteration

[@UniqueHandle977]

Yeah, accurate to gg!underfell.

[@SleepyPlushy]

Creative AF!

[@MyUsernameIsGoofy]

"Please, Susie. You think I'm not paying attention?" - Sans, the same guy who's whole gimmick is getting distracted

[@garsrandom4358]

Kris: well I guess you were paying attention to the wrong person… everyone matters you know?

[@JezElectro13]

Sans Underfell is the boss I realized a trend in Pacifist Route final bosses: You always fight someone you WANT to kill and have no real reason to spare. I love this fight so much.

[@arloklenczon6811]

Flowey sadistically murdered everyone in the Underground out of boredom countless times... Porky allied himself with the embodiment of evil and will go on to commit countless atrocities throughout space-time, even trying to bring about the end of his universe... Sans tortured an orphan to a slow and painful death to satisfy his twisted desires and pleasures, likely did the same to so many others and will ultimately end up killing so many more if we let him go, maybe even his own brother... These assholes didn't deserve mercy. But we spared them anyway. And every time the enemy gets more and more psychotic. People talk about how Genocide/Obliteration is a test of how far we're willing to go but the same can be said about Pacifist. And they can only get worse from here.

[@JezElectro13]

@@arloklenczon6811 I wonder how big of a test final boss will be?

[@miguelcrafter2997]

Its just that the enemies will not accept your mercy at all He wants to kill you more than Flowey

[@TheFawfulExpressMustardO-cx6mw]

I'm wondering if there's some big boss rush waiting for us in the LOSTCORE so all the bosses we spared come back for one more shot at revenge.

[@jacksonvoet8312]

Arlo, dude. Flowey was necessary for the true pacifist ending, and we players know his backstory. We didn’t want to kill Porky’s mech, which didn’t even want to fight. We only really spared Sans to avoid proving him right and to jumpstart Papyrus’s character arc.

[@smashssf2_ssbc15]

I loved how Kris furiously attacks Sans from behind with their knife. Legit dealing 120 damage! They don't deal anything close to it during the fight (at least in Pacifist). This really shows how much they care about Susie.

[@Bowser6495]

Also along with what you said he also retains that damage when you enter battle with him so that's cool

[@smashssf2_ssbc15]

@@Bowser6495 Oh! I didn't notice that! That's also so damn cool!

[@LouX453]

Even in obliteration he deals like 70 max Dude was legit furious

[@smashssf2_ssbc15]

​@@LouX453 Thanks for the info!

[@Karma-Rv]

Interestingly enough, if Kris drinks Susie's tea, it restores 120 hp for them. Perhaps we'll see that number go up pretty soon.

[@mathguy3451]

7:17 that sync. That was very nice.

[@SussusAmogus-r4o]

Oh god they actually made such a good sans fight. There's isn't and overabudance of gasterblasters and bones on screen each second, the attacks don't take half of your hp for the slightest mistake, and they double jump/dash mechanic is actually really fun to use. Like yeah, this fight isn't REALLY easy or anything, but it's actually beatable without having to do 30 attempts and break your keyboard, while still retaining the whole sans moveset. Makes it even better since i had only 2 hp left on Kris with everyone else dead when the gaster blaster ring started, so it felt very stressful.

[@skell6134]

Its still quite obnoxiously LONG considering how many damn red busters Fell Sans tank somehow for zero reason He maybe really high LV and all that but its not justified still :p Also i got caught off guard with final attack too,even tho i guess i should've expected that And i been forced to dual heal a bit too much cause he still racks up some damage with his attacks being so difficult do dodge at times

[@antunderexist692]

its not Canon Underfell so dont mind it man its like an alternative timeline of underfell.@@skell6134

[@marcusjones2976]

Sg distrust

[@beefygaming_realnofake]

@@skell6134actually it is completely justified, this is a different stronger sans, and a higher level WOULD buff hp alot, so cope

[@skell6134]

@@beefygaming_realnofake Bro is eating Red Busters for breakfast,it makes 0 sense

[@MajorSlackie]

There is hope for papyrus turning back, but there is no way sans is after killing children for almost no reason at all

[@garsrandom4358]

10:58 gotta love the King of spades ref

[@pancakes8670]

I think it's based on a popular theory that Spade King was a symbol for Susie's own father. Deltatraveler seems to be based on this idea that her own dad threatened her a lot.

[@Matoro_9999]

Basically underfell sans but with the attitude and ruthless personality of killer sans love it

[@TehLoracs]

A ridiculous au name: revertkillerfell I want to kill myself after typing that.

[@Endrgamr262]

@@TehLoracs it’s called GGundetrfell for a reason

[@DieselMonstar965]

@@TehLoracs lol

[@sora654able1]

TBH, this was actually a fun fight. Hard, sure, but doable, and I do like how in the more violent routes, you are affected by KR while in the pacifist route, you aren't.

[@poliswag6666]

Kris backstabbed Sans the moment he began talking shit about Susie. god, Kris really does like Susie

[@kauedasilva1072]

I thought the Susie Tea made that clear.

[@RoyalGriffin.]

Tbf, I don't blame him. Just hearing him talk shit about a child that he killed for basically no reason will make any good hearted person angry.

[@DallasReimer]

I feel so bad for Underfell papyrus and I hope that Underfell sans can become a good person again.

[@skell6134]

Bro he literally murdered children,aint no way he going to be normal

[@KrispBacon518]

He’s better off dead

[@DallasReimer]

@@skell6134 yeah true so it really does look like the old sans and papyrus’s brother is long gone.

[@skell6134]

@@DallasReimer I mean,you can make him just stop being such jerk but he is still not gonna be same UT Sans

[@DallasReimer]

@@skell6134 yeah but I’m sure that he’s done in deltatraveler but we’ll see more in the Underfell series.

[@ankhangnguyenoan9205]

well this Sans is really built more different and his moral is more senselessness than other good Fell variants' standards

[@elliotsturtplus340]

I love how the box is smacking against Susie suggesting that Fell is attacking Susie over and over again

[@cat-1.00]

yep

[@satiosnewaccount4606]

This sans is literally fucked up, holy shit.

[@D_YellowMadness]

Figuratively.

[@MyUsernameIsGoofy]

This is seriously some of the coolest shit. It's so terrifying. What makes it all the more unsettling is it's characters you know too.

[@xandtheironminer602]

​​@MyUsernameIsGoofy Bro why do I keep seeing this comment everywhere I go bro (I saw it 3 times in the span of several months In fact I was thinking about this EXACT comment just earlier. What makes it all the more unsettling is that it's a comment you know too.

[@skell6134]

Overall my strategy for this entire fight considering i suck at perfectly dodging was just keeping rotation of Red Buster and Dual heal constantly and defending entire fight Using Normal attacks against him is nearly useless even with ice weapon,i dunno why in hell normal Sans recommended to go for those

[@cyanideytcuriousseadoggo]

Probs for players who want to not get a gruesome kill to occur

[@skell6134]

@@cyanideytcuriousseadoggo You just end fight with Pacify for that And i wouldnt kill him anyway cause im doing Pacifist and not Obliteration

[@twotailedpikachu8491]

Maybe we were supposed to use iceshock more?

[@skell6134]

@@twotailedpikachu8491 Ise shock on pacifist deals little to no damage

[@gamertypeawesome]

You need an ice weapon on Noelle for her to be able to use sleep mist or whatever it's called

[@Glaster6]

“I was this close to killing him myself” -Susie, 1 HP

[@pancakes8670]

No ones pointed out, but I love how the terrible actions of Fell Sans pushes Fell Papyrus to become a better person in the end. Its kinda like how IRL, sometimes Abusers can end up pushing their Victims away from them. Fell Papyrus ended up realizing that he needed to distance himself from Fell Sans, which is a surprising level of maturity coming from a Papyrus.

[@kirilantonov6768]

fun fact: at 5:55 his left eye starts twiching

[@ethanrobloxyt]

fun fact: if you hold the down arrow on a platform, then use Z to (dash?), then you will phase through the platform.

[@coolDude-sx6we]

Once during the. Attack at 4:43 I rode one of the platforms and was pushed out of the box somehow My game crashed

[@Bluesit32]

I fell too, but my game didn't crash. Just made it so Sans couldn't hit me.

[@chickennuggetman2593]

WHAT'S THIS? YOU ARE NOT SUPPOSED TO BE HERE. I WILL SEND YOU BACK.

[@Ti_Uccidero]

Papyrus' speech is so sad honestly :(

[@marcusjones2976]

This is the first time ive seen sans with a lot of hp....well besides dusttale

[@dio9112]

Welp he is from underfell, he literally kills everybody he doesn't like and gains exp wich makes his LV grow alot

[@classicrice7639]

​@@dio9112he just straight up kills people in GG!underfell tho

[@dio9112]

@@thehuman9464 in code he's hp is literally 1,but there was mechanic. When frisk sleeps (or at least tries) in snowdin and hotland hotel, they gained extra hp. So sans sleeps a lot to get more hp i guess?

[@nathangd5136]

@@dio9112papyrus does mention “the first sleep you ever had in a long time…” tho

[@classicrice7639]

​@@dio9112i dont think sleeping in the hotel stacks up max hp

[@trainerlsw]

This is not a Sans that has to adapt to a new world, its a Sans that is one within its nature.

[@nilswagner9379]

7:10 man can we just appreciate the timing with the music and the hits ?

[@Gnosis1114]

Kris hold herself, he just attack seriously when sans threat susie, it is cute

[@PeterBoyMC]

mf put some random pronouns for Kris and STILL got it wrong

[@xandtheironminer602]

Kris is confirmed to be a they.

[@AshAshina]

​@@xandtheironminer602What do you mean "They"? I see only one Kris at the screen.

[@xandtheironminer602]

@AshAshina Sorry, I meant "the," singular form of "they," of course.

[@omarkhalili6948]

Fun fact: in the original gg underfell animation sans does 10 damage but that had to be changed here for obvious reasons

[@arloklenczon6811]

Sans murdered a child. A little girl. Not for any personal gain, but because he enjoyed it. Because it made him feel powerful. Because he wanted to play God. And hell, his dialogue implies he took his time killing Suzy. He tortured an orphan to death just to see the hope die in her eyes. Fucking hell, RynoGG. Should I be concerned for your mental health?

[@LegoWhisbecauseyes]

He even surprassed Dust Sans, Jevil and Spamton in terms of insanity I bet even Gaster actually felt fear when he heard about it

[@lizardwithinternet1314]

…you know, I wonder if he did that because Suzy didn’t hate humans as much as he does. Look what he did with his universes frisk for example, his kill attempt was extremely quick. What I’m saying is, I think something set him off with Suzy. And I wonder if that thing is Suzy saying humans shouldn’t die.

[@zottorus6176]

@@theforgivingwarriorwhat is good media to u?

[@enigmaticencounterlol3277]

@@theforgivingwarriorTS Underswap?

[@catseer1299]

Don’t respond to the person who is trash talking this game, they want attention and will stop if you don’t give it to them

[@coolDude-sx6we]

I wish I had the skills not be hit once between going to bed and getting extra HP and this fight Because I can’t beat it and any bit of health helps

[@Insert_Name_Here908]

This sans fight is so much better than most other ones from fans. It’s not just a repeat of the genocide fight with a slight difference. He’s actually the one attacking you, not the other way around. It’s refreshing.

[@isimyok960]

Honestly i think it should be harder. When i fought him i was level 8 or 9 and despite not using stuff like rude buster (for some reason even after distracting him with Noelle he dodged rude buster so i thought the only way to damage him is do normal attacks meanwhile distract him with one party member) i died to him only 3 times (one fo them was only because i had low hp when he did the final attack). Dualheal, low damage, and low kr damage (the kr in original sans fight depletes your hp much faster) makes this fight literally way easier than it's original UT counterpart

[@Endrgamr262]

Am I the only one that was willing to kill this sans

[@PeterBoyMC]

no even Susie was

[@andrzej8144]

Nope. I did too, and gosh was it amazing feeling killing him and getting to level 9

[@bellhop_phantom]

In true sans fashion, I went into the final attack at full health across the board and came out with... Susie at 1. Nice Undertale yellow's gotten me interested in giving fangames a shot recently. Definitely a good decision, I like this one! Can't wait to see where it'll go

[@arishachoudhury_]

undertale yellow is sick

[@xandtheironminer602]

Undertale Yellow was the first fangame I ever played. Well, besides the games on Scratch, but we don't talk about those.

[@callumconnors5190]

Recommend TS underswap

[@BeTalf]

On first try he is pretty hard but you can still pass a few attacks. Then suddenly you learn dash mechanic and the battle becomes way easier. On second try you pretty much know all the attacks and beat it without breaking your keyboard. Its not hard or easy its a medium fight. I really enjoyed that

[@skell6134]

Final attack is pain in ass tho aside from fight itself being too long

[@tealover2871]

​@@skell6134 Well, I've beaten this fight on my third try, the same try I got to the last attack.

[@james1311na]

dying in the last attack got me suicidal dawg @@tealover2871

[@MobilePortingz]

Funny Fact, If You Have Buster Blade And Hit The Fight Thingy At The Right Time, It Will Actually Bypass The Dodging And Hurt Fell Sans. Even Without Using Distractions.

[@Jessica_Schweser]

I think I did that once but I forgot if he was distracted or not

[@Nate2010]

I died to the circle attack at the end not because it's difficult, but because I thought it was gonna get really fast so I stayed close to the beam and got hit

[@Midtier_Fortune]

this battle made me go neutral because I couldn't bring myself to spare him.

[@Petruso_]

i hate that i have to spare him for the pacifist run

[@JezElectro13]

I adore this music!

[@arloklenczon6811]

Eye for an Eye.

[@alithe_epic]

I love how the fight is fair

[@interesting3981]

Oh damn GG underfell.

[@Chara_notdremurr3]

I've dealt with that. here's how u beat him, KEEP ATTACKING.

[@jiandequino2994]

i think bro wants kris's soul

[@Goofy091-gz8ms]

Just imagine hard would this be if they removed all the invincibility frames

[@kauedasilva1072]

I mean Karma is a thing in the Obliteration Route, but it ain’t as bad as in Undertale.

[@mettatonfanboy]

soul do be jumping around like v1 or something

[@funnylittlecreature]

suzy.... i remember you're *death*

[@anonymousxiii4780]

This fight was nuts it took me about 2 hours to beat him but yeah this fight was amazing. 10/10 would fight and spare Sans again.

[@MarksmanRevolver]

fuckin' william sanston

[@novaevan]

I made the mistake of killing flowey... and now I regret it...

[@PeterBoyMC]

Me when I deliberately save after making the wrong choice without even trying to quit and go back to the previous save (I want to regret later)

[@skylertham6431]

This section must've been the most trauma inducing for the main cast unless HELP_TALE or any other kind of fucked up undertale like universe is the universe they're going into from that door

[@chickennuggetman2593]

Finally, someone mentions helptale

[@alesgerbet3212]

Realy important, how much def and attack gg underfell sans has

[@alesgerbet3212]

for anyone wondering, I found out already it's 40 atk and 1 def

[@FoxFireStarlight]

I definitely shouldnt have played this on my phone, arg-

[@dymaz_azure]

Skill issue

[@DarkGope]

Man i sure hope nothing bad happened to this sans dude like changing his character!

[@janseriksgames6981]

I did it in v3.0.7, after a lot of training. No fight button or items. Only: XDistract to make him vulnerable, Red Buster to dmg, Dual Heal if critical hp and defend when I can't perform these skill attacks. But in v3.0.7 fight is nerfed comparing to this.

[@Ena_0082]

I hate this fight I was having quite a bit of fun playing this game until this fight I can’t get past his first few attacks (I suck at this game) so yeah I can’t even finish the game because of this which is a shame because this was a great fan game until this fight

[@metal42]

You'll get better as you keep trying, just like the og sans fight.

[@nicholasmeinhart5993]

I found the fight with Ness and Paula a lot harder than the Sans one tbh

[@Ringo_Asakura]

Funny thing is.. It's Deltarune and EARTHBOUND fangame mostly. Despite the fact of original Idea of Deltarune + Undertale. RynoGG was carried away..

[@powerONdelta]

It's always the blue and orange gaster blasters I get stuck on

[@Rokk_]

They updated the game by the way and changed a bunch of dialogue for this encounter.

[@BsCloverBz]

Me at mobile knowing that my controller is gonna get bugged at one moment😭

[@matveyfuks]

Tip: never get susie into devious or else it would be like hardmode

[@oops14314]

idk what you mean but i'll make sure

[@akfbqoabepajsoa]

Just look at her sprite You know when she will desobey

[@Amit_edits_5000]

Most of the fight really turns really easy with the dual heal

[@DaDrawBoi]

Finally beat this dude

[@Mimic_Lord]

I originally was going to spare him in my pacifist route. Guess I'm gonna do a neutral route!

[@drrockstar4040]

You get more xp if you attack him instead of using sleep mist.

[@Billyboi76]

I don't want to say anything but I think that underfell Sans is obliteration route ness

[@justaperson9504]

They day when people do a acurrate fell sans more than just "i kill for fun, im a v1ol---4tor and a ab---us3r" is gonna be the end of the world.

[@jacksonvoet8312]

I mean, this one is a specific interpretation of Underfell, in which not everybody is even evil, but kill or be killed is the norm, perhaps even the rule of that world. Red Sans, having apparently been wronged by a version of the delta travelers, and left without hope before snapping and becoming an absolute terror, is the one who caused the ideal to spread so far.

[@akram_ati]

This sans fight is making me suffer

[@javel-to9fv]

12:28 SAD moment

[@jobve.]

Man i love gg! Underfell sans

[@Saulgoodman9776]

I just cant get past his final attack, everything other is easy but his final attack is just Impossible

[@VerticalHeist]

He is red already

[@MorphMV]

1:09 to 1:20 sum I wonder where those notes come from fr. I want to listen to it in repeat and more.

[@vibrantdk]

If you're talking about the song in the background It's gallery from deltarune

[@MorphMV]

@@vibrantdk bet give me a specific name of it if you can

[@MorphMV]

@@vibrantdk wait nevermind found it thank you

[@angelnati8297]

They got corrupted

[@dereckteixeira9520]

Anybody else just have susie fucking suicide when they pick red buster?

[@Insert_Name_Here908]

You’re on genocide route, right? Yeah, that’s intentional

[@dereckteixeira9520]

@@Insert_Name_Here908 yep i found out

[@listopadnichek7010]

10:41 санс спит

[@PyromancedBro]

Where did u get that metal bat that Kris is holding?

[@Paulin-11751h]

You buy it from Sans in Section 2 of Deltatraveler

[@PeterBoyMC]

Aluminium Bat, Egg reward of section 2

[@PyromancedBro]

@@PeterBoyMC can u get it from the genocide route???

[@PeterBoyMC]

@@PyromancedBro no, eggs are only obtainable on a no EXP run, and by the end of section 2 you get a better weapon for Kris anyway

[@PyromancedBro]

@@PeterBoyMC oh thanks

[@Sansational69Sansational-iz5dy]

Bruh this stupid fight is impossible on mobile the dash never works

[@cross6939]

He has no golden teeth 😢

[@funkymonkey7252]

he don’t care abt fashion like fell he just wanna beat the crap outta everyone fr

[@Rubentemira]

golden teeth kinda edgy tho remember underfell is just about the underground being actually kill or be killed there’s no point in making them edgy

[@Bluesit32]

This is the developers interpretation of Underfell.

[@littleprowl]

@@Rubentemira he canonically has a golden tooth, and this version of uf!sans is more edgy than regular uf!sans imo

[@MyUsernameIsGoofy]

He sold them

[@santiversoloquendo5780]

hola

[@dantzy01]

Iam stuck in chapter 3 Because This 🙁

[@gabrielnavia-d3m]

12:42

[@itsblonk]

Easiest undertale fangame.

[@Itan002]

The point is being a continuation to the meme "Kris where the hell are we" not for difficulty.

[@LouX453]

Fans when an undertale fangame isn't made of moves almost impossible to dodge without breaking both your keyboard and hands :

[@FriskyJackopumpkin]

I literally bad at this

[@nevergoon42]

you what to sans

[@gabrielnavia-d3m]

finally 2:13 someone who knows what to do

[@KingNoahCraft5]

..jumping?

[@Ricklet0ons]

This sanes fight is impossible in the mobile import of this game absolute BS this is in mobile port

[@Skele-ton]

Honestly worst part in the game, got a lot of us stuck here without being able to keep playing

[@LilZappyUwU]

Oh cmon its not THAT hard unless ure playing on mobile then shit gets serious but its not impossible

[@Skele-ton]

@@LilZappyUwU took me an entire year to beat deltarune chapter 2, imagine

[@metal42]

​​@@LilZappyUwUit's doable even in mobile, I haven't beaten him yet but I've been able to get to his final attack many times, you just need to keep trying everytime you die just like the classic sans fight. Update: I beat him.

[@ArthurVlad]

​@@Skele-tonFinish chapter 2 in a year, it's not because it's difficult, it's just because you don't feel like it? Lol Also it is not the typical sans of any other fangames [Oh no hard 150x] that use gasters or KR.

[@Skele-ton]

@@ArthurVlad I couldn't get past berdly for months and the Queen's final battle :/

[@DonnyLorYT]

I liked my own comment (pls dont like bruh)

[@Sansational69Sansational-iz5dy]

Bro is 5

[@DonnyLorYT]

I SAID DONT LIKE

[@DonnyLorYT]

WHO LIKED ME