Overview
Hello! Crystal here! and i’m here to present what to do while playing UNDERTALE.
Beginning
Now you’re at the beginning, players have a choice of choosing 3 major routes of completing the game. Neutral, Pacafist, and… Genocide. Before we dive right in, this guide includes major and i do mean, MAJOR spoilers so if you haven’t played Undertale i’d highly recommend you do that because… ya know. So let’s dive right in!
Neutral Route
This is the Neutral/Normal Route. This route is rather depressing. The Final Boss is Flowey. after fighting him (no true reset or genocide route) after fighting ASGORE, Flowey kills him and his fight is skipped with Flowey knowing the souls would just revolt again.
This ending occurs when you haven’t started a Genocide Route (killing everyone) or a True Pacafist route (befriending everyone) have not been met, or if the protagonist on their first playthrough did not kill anyone as access to the True Pacifist Route.
There are many versions of this ending, all consisting of Sans calling the protagonist’s Phone and leaving a message telling Frisk of the Underground’s fate. However, the content of the phone call is based upon the actions that the protagonist has made throughout the game. The track An Ending plays during the call, except in the Mettaton, Leaderless, Dog, Alphys, and Impossible variants.
Neutral Epilouge
In all of the neutral route endings, Alphys says that the protagonist has to kill ASGORE and take his soul because she explains the fact that you need a human soul AND a monster soul to cross the barrier. Consistent across all Neutral Route epilogues:
Asgore is killed from Frisk or Flowey (♥♥♥♥.)
Flowey is defeated (from Frisk with the help of the 6 human SOULS)
The six human SOULs are lost
The monsters remain trapped behind the barrier and think that Frisk escapes the Underground.
After the brief, uninspiring dialogue of the route, Sans calls the Frisk’s Phone to leave a message on Frisk’s adventure.
KEEP IN MIND THAT THIS IS A GAME WHERE CHOICES MATTER.
Bonus/Sans Remarks/Judges on how you clear the Neutral Run
Never used consumables.
Never killed Papyrus.
Never removed the Bandage.
Is at LV 1.
Sans comments on the Frisk’s ability to challenge themself, but tells them not to brag about it.
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Never used consumables.
Never killed Papyrus.
Sans asks if they ever had something to eat.
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Wearing the Bandage.
Never killed Papyrus.
Sans comments if Frisk is still wearing the gross bandage they started out with.
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Never SAVE.
Never killed Papyrus.
Sans suggests that the protagonist SAVE their game.
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Has the Snowman Piece.
Never killed Papyrus.
Sans mentions that a certain snowman is really happy.
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Did not meet any of the special requirements listed above or has killed Papyrus.
Sans simply leaves a message for the protagonist.
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Aborted the Genocide Route in Hotland.
Sans immediately hands the phone over to Alphys.
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Toriel Ending Tree
Requirements: Toriel is spared.
Toriel has returns to her title as the Queen of the Underground and has instated a policy of “Humans not being treated as enemies, but as friends.” This ending then branches into one of three variants: the “Family Ending,” the “Betrayed Undyne Ending,” or the “Exiled Queen Ending.”
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Flawed Pacafist Ending
Requirements: Frisk has befriended Papyrus and Undyne and has defeated ASGORE.
Despite the disappearance of the human SOULs and ASGORE’s death (because of that bastard flower), Toriel rouses the spirits of the Underground’s residents and tells them not to give in to despair. Sans then tells Frisk never to give up.
The call passes to Papyrus, who proudly proclaims his new position as “captain of the royal guard.” This turns out to be a figurehead position, as the Royal Guard (whose primary responsibility was to keep watch for human SOULs) has in fact been disbanded. His only real duty is tending to the garden of the New Home castle.
The former Royal Guard captain Undyne then enters the call and explains that she has found new work as Alphys’s lab assistant. She has also been appointed to be the gym teacher of Toriel’s new school; she boasts that she can bench-press seven children. The next part of this ending varies depending on whether the protagonist has dated Alphys.
If the protagonist has not dated Alphys: Alphys becomes even more reclusive. However, Undyne confidently states that she can help Alphys work through whatever is bothering her. Undyne also reminds the protagonist that she and the other monsters sacrificed a great deal to help Frisk return to the human world to help Frisk; for that reason, Frisk should enjoy life on the Surface to the greatest and that sacrifice was worth it. (nice job undyne)
If the protagonist has dated Alphys: Undyne ropes her into the call. Alphys first reassures the protagonist that Mettaton is doing okay, and then goes on to mention that she is searching for a new way to free the inhabitants of the Underground. She is working harder than ever, mostly because Toriel is a much stricter supervisor than Asgore ever was.
At this point, it occurs to Undyne/Alphys to ask Toriel to join the conversation; however, Toriel simply tells her that she is busy, not realizing that the protagonist is on the other end of the line. Papyrus and Sans joke that Toriel would probably tie up the line for hours if she only knew the protagonist was on the phone, and that they “HAVE THE MERCY TO SPARE YOU FROM HER.” Undyne and Alphys (if she was dragged into the call), then suggest calling back anytime as she would love to talk.
The call ends with Sans mentioning that the phone is low on batteries, and everyone says goodbye.
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Betrayed Undyne Ending
Requirements: Frisk did or did not befriend Undyne and killed less than ten monsters, or killed Mettaton. Undyne cannot be befriended if the protagonist had killed monsters before initiating her hangout.
Toriel tries her best to tell the inhabitants of the Underground not to give up even though their situation is rather…. not gud. Sans also tells Frisk that they should not give up either. Sans then hands the phone over to Papyrus, who takes over for the remainder of the call. Papyrus states that Undyne has it rough since she lost her job and her house, then says that he and Sans are taking care of her now. Sans has hired her at his illegal hot dog stand in Hotland, except Undyne hates working there. The rest of the phone call branches into three different paths depending on what Frisk has done. Befriending Undyne simply causes Undyne to hate Frisk more than ever since they betrayed her trust and killed someone.
If Frisk has not befriended Undyne: Undyne simply blames Frisk for Asgore’s death. Papyrus mentions that she has a plan to cross the barrier and beat up Frisk (damn). Papyrus thinks her plan is impossible but also hopes that it is not since it would mean meeting with Frisk again, even if it does mean fighting them. Papyrus then tells Frisk to keep their fingers crossed and to keep in touch to make their plans easier.
If Frisk killed Mettaton regardless of befriending Undyne or not: Undyne is devastated since Asgore and Alphys are gone. She says things like “I couldn’t protect her,” and it is hard to get her to do anything (double damn). Papyrus suggests that she goes after Frisk to get revenge, but Undyne says “Revenge won’t bring anybody back.” Papyrus is unaware of their deaths, so he asks Frisk to bring her friends back since Undyne is not doing so well.
If Frisk has befriended Undyne and killed monsters afterward: Undyne hates herself for becoming friends with Frisk because they had murdered someone shortly after they had formed a friendship. She feels hurt, betrayed, and angry at herself, and does not understand why she let herself be friends with Frisk. She says that she knew what humans were like but failed to resist becoming friends; because of her mistake, more people got hurt. Papyrus then suggests Frisk to “PROBABLY NEVER COME BACK HERE” since Undyne would destroy them and even the queen cannot stop her.
The call ends with Papyrus saying goodbye (forever, if in the third branch) to the protagonist.
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Neutral Requirements (Continued)
Exiled Queen Ending
Requirements: Frisk has also killed ten monsters, Papyrus, or Undyne.
Toriel’s new policy was met with severe backlash since Frisk has killed Papyrus, Undyne, or countless monsters in the Underground, so a rebellion was formed to overthrow the queen.
If Undyne is alive: Undyne gets enraged that Asgore was killed, and, if Mettaton is dead, Alphys disappears, nowhere to be found by the other characters (it is possible that she commits suicide in the True Lab). Undyne spearheads the revolutions and banishes Toriel back into the Ruins. Sans comments that Undyne seems to be more vehement about destroying humanity than Asgore was.
If Undyne is dead: Toriel just peacefully resigns and returns to the Ruins after hearing about the rebellion, causing the Underground to become an uneasy and hopeless anarchy.
Sans mentions that he decided to accompany Toriel when she returned to the Ruins and brought her books from the library in Snowdin so that she does not have to read the same ones.
If Papyrus is alive: Papyrus also accompanies Toriel in the Ruins and even plays games with her. Both Papyrus and Sans have also convinced Toriel to leave the Ruins sometimes, as long as either of them stay behind and keep watch for humans. Papyrus says that he loves to stand in for the Queen and is practicing to become a great mom when they come (probably due to the Greenlight trailer where Papyrus asks “IS IT ME? AM I THE MOM?”). Sans ends the call hoping “things are better” wherever the protagonist is.
If Papyrus is dead: Sans calls Toriel a good roommate and mentions how she sometimes talks about how she would like to see Frisk again. Sans does not have the heart to tell Toriel that they killed Papyrus because she protected them. He then ends the call with “never come back here. you are not welcome.”
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Undyne Ending
Requirements: Toriel is dead but Undyne is alive.
Undyne becomes the ruler of the Underground and enforces a policy to destroy all humans who enter. She plans to wage war on humanity, has militarized the Underground, and plans to personally destroy Frisk. Sans mentions not being able to reach Toriel and, if Papyrus is dead, implies that she has been killed and that the protagonist is responsible, and warns them to watch themself as “things are lookin real bad for you.”
However, if Papyrus is alive, Sans simply says that Toriel might not be feeling well, allowing Papyrus to interrupt the call and tell Frisk that Undyne has appointed Papyrus to “The Most Important Royal Position,” which is a figurehead position where he stands around and looks cute, but he is proud of it. Papyrus says that Frisk should come and visit, though he also says that Undyne will probably kill them if they do, but says that they should risk it.
Regardless of Mettaton’s status, it has no effect on the dialogue of this ending.
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Mettaton Ending
Requirements: Toriel and Undyne are dead, but Mettaton is alive.
Mettaton becomes ruler of the Underground since Undyne disappeared, and establishes a dystopian society in which he brainwashes the entire Underground with his television show. Sans mentions that he became his agent and then hands over the phone to Mettaton.
Mettaton establishes a policy on humanity that any human that falls can join his fan club for free. He says that he has created a statue of Alphys, but then goes on to say that he was “not the greatest to her.” He says that he was going to apologize to Alphys and ask her to help him rule, but could not find her, and emphasizes “TRUST ME. I LOOKED.” It is implied that Alphys either commits suicide or runs away (likely into the True Lab). Mettaton then asks Frisk to think of him always and ends the phone call there.
If Papyrus is alive and befriended, he then joins the call to mention that he has become Mettaton’s second agent. He says that things have gotten a lot better since Frisk (excluding the fact that everything sucks and anyone who does not worship Mettaton goes missing), but misses Undyne and asks the protagonist to say “hi” if they see her.
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Papyrus Ending
Requirements: Toriel, Undyne and Mettaton are dead, but Papyrus is alive.
By process of elimination, Papyrus becomes the ruler of the Underground, though Sans does most of the work. Sans tells Papyrus that Asgore, Alphys, Mettaton, and Undyne are on vacation. The Underground is improving; productivity is up, and Papyrus cooks everyone spaghetti. The human policy instituted is that humans cannot be judged to be all good or all bad. Either way, they get puzzles. Once Sans leaves, Papyrus expresses distress on his new responsibility as the ruler when people “WANT TO GIVE UP” and how he misses all his friends; he mentions how Undyne never picks up his calls, and that she must be really enjoying herself on vacation. However, Papyrus reassures the protagonist that he is determined to “MAKE EVERYONE GIVE UP GIVING UP”, and hopes to get out of the Underground and hang out with Frisk again.
It’s Showtime! plays during this ending.
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Dog Ending
Requirements: Only Toriel, Papyrus, Undyne, and Mettaton are dead. All other monsters are alive, Glyde, So Sorry, and Mad Mew Mew included.
A small, white dog becomes the president of the Underground. The dog sleeps on the throne and does absolutely nothing. Strangely, this is the best life for everyone. Oddly enough, Sans does not mention Frisk killing Papyrus in this phone call and thanks the protagonist for the results. “Dogsong” plays during the call just like in the Impossible Ending.
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Leaderless Ending
For the other definition of “No Mercy Route”, where all possible monsters are killed, see Genocide Route.
Requirements: Toriel, Papyrus, Undyne, Mettaton, and at least one (but not every) non-boss monster has been killed.
The Underground is leaderless and less crowded. Things have gotten pretty bad. The mood is somber, and people feel as if they are just going to die in the Underground, trapped in the dark. Sans says he is not the ruler because he is not cut out for something like that, and he likes to take it easy (which is a joke; he says this is what happens when people like him decide to take it easy). Sans then tells Frisk “go to hell.” If less than 20 non-boss monsters were killed, Sans says “see ya.” instead.
A variant of this, where all encounters (but not all possible monsters) were killed, is known as the No Mercy or Neutral No Mercy Route. This offers no different dialogue than any other Leaderless ending.
mus_wind plays during this ending, an ambient track similar to that played when the game is restarted after a Genocide Route.
[link]
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Neutral Requirements Continued Continued
Alphys Ending (Near Genocide)
Requirements: Frisk followed the Genocide Route requirements throughout Waterfall but aborted the route during the travel through Hotland.
Frisk does not encounter Alphys during this route, as the ending requires killing Undyne the Undying, which preempts Frisk’s meeting with Alphys in Hotland. After Sans finds Frisk’s contact information, he hands the phone over to Alphys, who has now become the new ruler of the Underground.
Alphys explains that after hearing Undyne’s last words, her resolve was strengthened, and she proceeded to evacuate the remaining monsters in the Underground to a safe location (presumably the True Lab). The survivors lauded her as a hero and elected her as the new ruler. Despite her confidence in her governing abilities, she remains anxious around people. After mourning the loss of her friends, she ends the call saying that she should have killed Frisk when she had the chance.
No music plays during this ending.
[link]
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Impossible Ending (Dirty Hacker)
Requirements: The protagonist has somehow met none of the above requirements or hacked the game.
As “Dogsong” plays in the background, Sans says that he has no idea what Frisk has done to get this ending, and explains that the call is an error-handling message. He goes on to suggest contacting the developer so they can fix the game or add another ending. Sans then says “chances are, though… you’re just a dirty hacker, aren’t you? yeah, get outta here.” then simply hangs up.
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Conclusion
Geez…. this ending was depressing.
Flowey’s Parting Words
After the phone call, if Frisk had spared Flowey, he appears to talk to Frisk. His dialogue depends on Frisk’s actions during the neutral route.
If Frisk had killed some monsters, Flowey wonders if killing is necessary and asks Frisk if they can reach the ending again without killing, and he will not kill Asgore, and maybe Frisk will have their “happy ending.” Flowey remarks that he intends on watching before leaving.
If the player reloads their SAVE and triggers the neutral ending a second time, Flowey assumes Frisk wants to be friends with him. He proceeds to insult Frisk, saying that he only cares about one person but ultimately truly does not care about them.
If the player reloads their game and triggers the neutral ending a third time, Flowey asks if Frisk wants to start the Flowey Fan Club. He then tells Frisk to talk to Papyrus about it, as he started one multiple times. Flowey goes on to say that Papyrus was one of the better characters to mess around with and took a long time to get bored of him.
If the player reloads their game and triggers the neutral ending a fourth time, Flowey jokes about the Flowey Fan Club. Flowey then warns Frisk not to let Sans know anything about them, as he caused Flowey’s fair share of resets.
If the player reloads their game and triggers the neutral ending a fifth time, Flowey notes that Frisk simply bored and just wants to see what Flowey has to say. He then refuses to talk to Frisk the protagonist any further.
If the player reloads their game and triggers the neutral ending a sixth time and onwards, Flowey simply asks if Frisk has anything better to do.
If the player resets their game and reaches the neutral ending again without kills, Flowey notes that the ending is still the same and tells Frisk that their choices do not seem to matter. He then tells Frisk how to achieve a real happy ending: befriend Papyrus, Undyne, and Alphys.
If the player resets their game and reaches the neutral ending again with kills, Flowey agrees that killing is fine, but proceeds to scold Frisk for only going halfway.
If the player resets their game, reaches Asgore without kills, then kills Asgore at the end of the fight, Flowey scolds Frisk that they are trolling themself because all they had to do was befriend Papyrus, Undyne, and Alphys.
If Frisk killed no one, Flowey wonders why Frisk let him go and why they are being so nice despite leaving the monsters still in despair. He then tells them a way to get a better ending by befriending Papyrus, Undyne, and/or Alphys.
If Frisk befriended all the key characters without exploring the True Lab, Flowey tells Frisk to see Alphys, as their date has just begun.
If Frisk aborts the Genocide Route, Flowey complains that they were so close to real victory, but Frisk screwed it up. He begins to wonder if they wanted revenge against him but quickly insinuates that they wanted to see the happiness of the monsters before tearing it away. He then says that he will be “waiting for you.”
True Pacafist Route
Now that we’re finished talking about that depressing Route, we can finally move on to the good part of this guide!
The True Pacifist Route leads to one of the endings of Undertale. This ending can be considered to be the “true ending” to Undertale, leading to a happy conclusion and the complete credits.
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Method
Upon completing the Neutral Route, the protagonist receives a phone call after the credits that provides a hint to the next requirement for getting the True Pacifist Ending. If Flowey is spared, he appears afterward and elaborates on the hint, but if he is killed, the game immediately returns to the title screen. The protagonist can then reload their SAVE file to fulfill any missing requirements as long as they have not gained any EXP/LOVE; otherwise, they must reset their game. Note that killing Asgore or Flowey does not acquire any EXP, and the protagonist cannot SAVE after fighting them anyway.
The list of requirements are as follows:
Throughout the game, never kill any enemies or gain any EXP/LV; essentially, only use non-lethal battle exits (spare, flee, or battle-ending ACTs). FIGHTing monsters or killing the Dummy in the Ruins does not cause this route to be aborted, as they do not accrue EXP. If one accidentally kills a monster, they can simply reload their save file.
After fighting Papyrus, visit his house and complete the date/hangout with him.
After Undyne passes out from pursuing the protagonist, get a cup of water from the nearby water cooler and pour it on her.
Return to Waterfall and go to Undyne’s house. Papyrus is waiting outside. Talk to him to enter the house, then complete the “cooking lesson” and faux battle with Undyne.
Go through Hotland and the CORE. In Mettaton EX’s fight, get the ratings to 10,000 (this includes using Alphys’s phone upgrade to shoot at his heart during some of his combat rounds) to end the battle peacefully.
If the Neutral Route has not been completed in a previous playthrough, it needs to be completed first. The next series of events can be triggered in two ways, provided that no EXP/LV have been gained: either by going through the game normally from the beginning after completing a Neutral Route, or by reloading the final save file of a Neutral Route.
Backtrack out of the Core towards the MTT Resort, to the bridge connecting the two places. There, Undyne calls the protagonist, asking to deliver a letter for her.
Talk to Undyne outside of Papyrus’s house to receive Undyne’s Letter.
If the protagonist had reached the bridge without completing the “date” with Undyne, then backtracked to complete such, she gives them the letter after the hangout, unless their inventory is full, in which case they have to receive it from her at Papyrus’s house.
If the protagonist discards the letter, they can return to Undyne to receive Undyne’s Letter EX, which cannot be discarded.
Put the letter under the door of Alphys’s Lab and complete the “date” with her.
Upon leaving the Garbage Dump (where befriending Alphys ends), Papyrus calls and tells the protagonist to meet Alphys at her lab. Return to Alphys’s Lab to find a note leading to her “bathroom” containing the True Lab. Upon entering the True Lab, the True Pacifist Route cannot be aborted.
Find the four keys scattered throughout the True Lab and put them in their proper slots to open the generator room. Turn on the generator to trigger a conversation with Alphys. Head back to the elevator near the generator room to be warped to New Home, with the exit blocked off by vines. This signals that the True Pacifist Ending will occur. It is impossible to leave New Home after this point.
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Main Story
Completing Friendships
If Papyrus has not been befriended, backtrack to his house in Snowdin, where he is standing outside. Interact with him to initiate the date/hangout.
If Undyne has not been befriended, backtrack to her house in Waterfall, where Papyrus is standing outside. Interact with Papyrus to initiate the Hangout.
Befriending Alphys
At the entrance to the CORE, Undyne calls the protagonist (at the behest of Papyrus) to ask them to deliver her letter to Alphys.
If Undyne was befriended in the Pacifist-Neutral Route, she would give the protagonist the letter immediately after befriending her. She says that Papyrus suggested giving the protagonist the letter earlier, but that Undyne still hated them at the time.
After delivering the letter to Alphys, she mistakes the letter as being from the protagonist themself and goes on a date with them.
During Alphys’s date, the two go to the Garbage Dump. They bump into Undyne, who decided to deliver the letter herself. Alphys tells Undyne some truths about her ‘scientific’ work, which was just her lazing around, watching anime and reading manga. Undyne expresses her support for Alphys, sending her off to train with Papyrus. She then confronts the protagonist about anime, asking if it is real. Regardless of the protagonist’s response, Undyne thanks them, and the event ends.
After the date, Papyrus calls the protagonist and very specifically instructs them to go to Alphys’s lab, citing no reason other than a ‘good feeling’ he claims to have about doing so. (This may be because Flowey told him to tell the protagonist, but did not want the protagonist to know.)
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True Lab
Arriving at the lab, the protagonist finds a note from Alphys, in which she declares she is going to “face her own mistakes.” The note tells the reader to enter what was previously thought to be Alphys’s bathroom to discover the truth, in case Alphys does not return.
The protagonist enters the door, which actually leads to an elevator. They take the elevator down to the True Lab, but it loses power and malfunctions, leaving them stuck in the lab. Exploring the lab, they find logs from long ago, detailing Alphys’s experiments with SOULs and Determination to restore monsters from death. Injecting determination into the dead monsters successfully restored them to life, but they melted and turned into Amalgamates – fusions of several monsters. Several of these amalgamates attack the protagonist, but the protagonist spares them. The protagonist sees the determination extractor, resembling part of Flowey’s form during his boss battle in the Neutral Route, and they learn that Alphys did some experiments with golden flowers, which produced a single living specimen who escaped.
The protagonist switches the power on, restoring power to the elevators. Some Amalgamates appear, but Alphys saves the protagonist from them, explaining that they were aggressive because they were hungry. She further explains that the monsters’ bodies could not handle the determination, and thus melted together. Alphys thanks the protagonist for their support and declares to the Amalgamates that they will return home.
Alphys leaves the true lab, and the protagonist returns to one of the elevators. They receive a call from someone they do not recognize. The voice, implied to be Asriel (Flowey mimicking his voice), calls the protagonist by the name given to the Fallen Human at the beginning of the game, and tells them that ‘everything has fallen into place’ and that they will ‘see you soon.’
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True Pacafist Route (Continued)
The Barrier
Before the barrier, it is witnessed that the vines shut off the entrance to the elevator the protagonist came from. Also, non-combative enemies do not appear along with Sans.
At the barrier, the protagonist confronts Asgore. As they prepare to fight, Toriel arrives, incapacitates Asgore, and consoles the protagonist. After reprimanding Asgore for his actions, even going as far as to give him a simpler way to retrieve human SOULs, she is shortly later followed by Sans, Papyrus, Undyne, and Alphys, who all begin to chat. To Alphys’s surprise, Papyrus reveals that a ‘tiny flower’ helped him call everybody to the Throne Room.
Flowey arrives and traps the other monsters in vines. He then thanks the protagonist for bringing them all to one spot, saying that he absorbed the humans’ SOULs while the protagonist’s friends were chatting, claiming he will absorb them all as well to achieve his ‘real form.’ He then reveals his true motive for causing the protagonist so much trouble – to keep them playing the ‘game’ so that they can ‘play’ with him forever. He gives the protagonist a chance to face him, promising to return everyone’s SOULs and break the barrier if they win. As if to deny them even this, he plans to keep them trapped before mercilessly attacking them, saying he is willing to “kill them 1,000,000 times” to prove his point. Before delivering the final blow, the protagonist’s friends protect them from Flowey’s attacks while both healing and encouraging them to win. Shortly afterward, many of the monsters that the protagonist spared throughout the game arrive, healing the protagonist and seemingly putting Flowey off guard. However, he suddenly laughs at them for their ‘stupidity’ and absorbs their SOULs.
The protagonist sees that Flowey is now a young monster in a striped shirt, similar in appearance to Toriel and Asgore. He calls the protagonist by the Fallen Human’s name, then transforms into an older, more powerful looking monster, introducing himself as Asriel Dreemurr. Asriel attacks the protagonist; if the protagonist’s HP reaches 0 and their SOUL breaks, instead of restarting the game, the message “But it refused” appears and the SOUL reforms through determination and fully restores its health. After this happens once, the SOUL simply reforms and return to the battle.
After a certain amount of turns, Asriel attacks with an attack called “Hyper Goner,” which resembles a goat skull (similar to the DT Extractor in the True Lab), sucking in bullets (and the SOUL) until the screen turns to white. The protagonist’s HP is left at one after this attack if they get hit. Surprised at the protagonist’s high determination, Asriel reveals that he was only using a fraction of his real power.
Asriel then transforms into a more powerful form of himself, threatening to reset the world’s timeline, restraining the protagonist and preventing them from doing anything except struggling. The protagonist realizes that while they cannot save their game, they can save the monsters’ SOULs, transforming the ACT option into the SAVE option. They reach out to their friends’ SOULs (who are trapped in Asriel’s SOUL) and bring them back by restoring their memories. After saving all their friends, the protagonist begins to save Asriel himself and see memories of him befriending the first human. The protagonist’s friends’ SOULs resonate within Asriel; he begins to cry, and his fire attacks start avoiding the protagonist’s SOUL. He then begs the protagonist (referring to them as the Fallen Human’s name) to let him win and attacks them with his strongest attack. The protagonist survives with their HP reduced to one ten-billionth of one point, and then saves Asriel, returning him to his form as a child.
Asriel apologizes to the protagonist. He tells them that the first human has been gone for a long time, and asks them for their real name, which is revealed to be “Frisk.” Asriel tells Frisk that the monsters’ SOULs allowed him to feel their emotions and desires – their love for Frisk and their desire for freedom, respectively. He expects Frisk not to forgive him for everything that happened, but they can choose to anyway, surprising Asriel. Using the six humans’ SOULs and the monsters’ SOULs along with their determination, Asriel destroys the barrier.
Asriel returns the SOULs and tells Frisk that without everyone’s SOULs, he will eventually return to a flower. He asks them to forget about him and leaves, but Frisk has the option to console Asriel, causing Frisk to approach and hug him.
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Epilogue
Undertale
Frisk wakes up in the room behind the Throne Room, much to the relief of their friends, who all know Frisk’s name but do not remember much about what just happened. Toriel encourages Frisk to do as they wish, whether that be heading for the Surface or going for a walk Underground to see the rest of their friends. The monsters inform Frisk that they will follow Frisk to the surface when they are ready.
Frisk can go through the Underground and talk to NPCs, including the several monsters encountered only during battle encounters. They express their feelings, often about being free at last. In the beginning area with the golden flowers, Asriel can be found tending the flowers and can be talked to.
True Pacafist Route (Continued Again)
The End
Leaving for the surface ends the game.
Frisk and their friends watch the sunset on the surface. Thinking about the future, Asgore asks Frisk if they would act as the monsters’ ambassador to the humans.
Papyrus leaves to make a good first impression on the humans, having declared himself the mascot or ambassador depending on Frisk’s decision. Sans retreats to the Underground (presumably through a shortcut) to ensure he does not have to check on Papyrus, while Undyne, Alphys, and Asgore leave to help Papyrus.
With everybody else gone, Toriel asks Frisk what they will do now. The protagonist can choose to stay with Toriel or not, and their decision affects the post-credits scene.
After Toriel and Frisk leave the screen, the True Pacifist Ending Credits starts. The names of all the monsters encountered in the game (except Jerry, non-Pacifist-exclusive Chilldrake, either Mad Dummy (if Mad Mew Mew is encountered) or Mad Mew Mew (if Mad Mew Mew is not encountered), and secret bosses So Sorry and Glyde) scroll down in a list ordered by area of encounter, interspersed with more developed main character animations. After this, a final bullet hell introduced by Asriel is initiated. This section includes the names of Kickstarter backers, and if all of the names are dodged, the Mysterious Door is unlocked.
After the credits, if Frisk is staying with Toriel, another scene plays, showing them in their new home on the surface. If Frisk parted ways with the monsters, then a photo of Frisk and their monster friends is shown. The Annoying Dog appears after some time on the ending screen. The player can do nothing except quit.
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If the player reopens the game, Flowey speaks to “the player,” telling them that “there’s nothing left to worry about.” He points out that the player is the only threat left, as they have the power to reset everything. He then asks them not to reset the game, which would return everybody to when they were trapped underground and asks the player to let them go. Flowey then asks that if they still wish to reset the game, the player needs to erase Flowey’s own memories as well. Believing they might have heard this a hundred times already, he says his goodbyes to the player, calling them by the name given to the fallen human at the beginning of the game.
The game’s menu has none of Frisk’s friends, as they have all left. The menu music is a significantly slowed down version, giving an ominous tone. The player can load their SAVE, which takes place before the ending, and they can replay the credits (and the special thanks) from there (though Asriel does not appear). The menu’s reset option is replaced with ‘True Reset’; this allows the player to rename the Fallen Human. Choosing a name resets the game and removes everybody’s (including Frisk’s and Flowey’s) memories.
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Post-Genocide Game
Main article: Genocide Route
After the protagonist completes a Genocide Route and restores the world after erasing it, several things are significantly altered.
If the protagonist chose “I have places to go” when Toriel asks, the picture in the credits shows all of the characters’ faces crossed out, and the protagonist is replaced with the sprite of the first human.
If the protagonist chose “I wish to stay with you”, after Toriel leaves the pie in the room, within four seconds, Frisk would turn in the bed to face the screen, only to reveal Chara’s face with red eyes. A low-pitched version of Flowey’s laugh plays, and the screen cuts to black.
The Annoying Dog does not appear to sleep under THE END after the credits.
The “THE END” text is displayed in red instead of white.
Anticipation plays at an extremely reduced speed at the end screen (slower than the times it is played in the Genocide Route itself), where Memory would usually play at normal speed.
Genocide Route
Now that we’ve had our relief, it’s time to go back into the depresso but with MORE depresso….
The Genocide Route…..
The Genocide Route leads to one of the three main endings of Undertale. It consists of the protagonist killing every possible monster in the Underground.
This route’s ending can occur without prior completion of the game. Once the protagonist completes a Genocide Route, subsequent True Pacifist Route endings are altered – even after a True Reset.
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Method
Battle text after the protagonist exhausts the kill count.
The Genocide Route occurs when the protagonist kills every enemy in every region: the Ruins, Snowdin Forest, Waterfall, and Hotland (the CORE is a sub-region of Hotland).
Starting in the Ruins, the protagonist intentionally triggers encounters and kills monsters until encounters with monsters no longer occur; this is similar to level-grinding in other RPGs. After killing all monsters in an area, encounters still occur, but monsters do not appear. In a font size smaller than usual, the battle text reads “But nobody came.”, which can also occur in a Neutral Route when you kill all monsters in an area.
After the protagonist sees this message, the music for the area changes to a distorted ambient track, mus_toomuch.ogg. This track is a part of Your Best Friend playing at 1/13th speed (~0.077x or ~92% slower) with added reverb.
After exiting the Ruins, most overworld songs are lower pitch, slower versions of their Neutral and True Pacifist Route counterparts.
If the protagonist stops meeting the requirements for a Genocide Route at any point, they revert to a Neutral Route where the unaltered soundtrack plays. NPCs still occur in the region where the protagonist abandoned a Genocide Route.
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Requirements
The first SAVE point in Snowdin Forest displays the kill counter for the first time.
Exhaust the random monster kill counter in every region. This requirement must be done before approaching the final encounter of that area.
The protagonist can spare any number of random encounters (Snowdrake is an exception, as seen below). Sparing certain monsters allows the protagonist to avoid fighting particular monsters such as the high-defense Jerry. The protagonist can also spare certain monsters so that they can kill monsters that offer more EXP and GOLD, such as Glyde.
The following is a table of the number of random encounters only that the protagonist must kill as stated at SAVE points in red text, followed by the final boss of the area.
Ruins: 20 kills (Toriel)
Snowdin: 16 kills (Papyrus)
Waterfall: 18 kills (Undyne the Undying)
Hotland/CORE: 40 kills (Mettaton NEO)
New Home: No kills (Sans) The protagonist automatically kills Asgore upon encountering him, while Flowey is killed when any of the action buttons are pressed.
Snowdrake is unique in that he must be killed before the kill counter is exhausted and is also part of the kill counter.
Once the protagonist satisfies the kill requirement, SAVE points display the message “Determination.”
Kill every boss and miniboss. (Secret bosses So Sorry and Mad Mew Mew are not accessible, and Glyde is optional.) All mini-bosses (excluding Snowdrake and including Shyren) can be encountered even after the kill counter is exhausted, which can be used to obtain extra EXP.
Toriel
Snowdrake
Doggo
Lesser Dog (random but mandatory encounter)
Dogi
Greater Dog
Papyrus
Shyren
Glad Dummy
Undyne the Undying (triggered by fighting Monster Kid)
Royal Guards
Muffet
Mettaton NEO
Kill counters for different areas have different requirements. If certain events are triggered before clearing an area completely of monsters, the protagonist is automatically sent back to a Neutral Route. For example, if Papyrus’s battle is initiated without exhausting the Snowdin kill counter, the cutscene proceeds as if on the Neutral Route. Even if the protagonist is captured and then goes back to finish off the last monsters, re-fighting Papyrus still proceeds as on the Neutral Route. Once a Genocide Route is aborted, it cannot be returned to without reloading to a SAVE before it was aborted or resetting entirely.
There is a glitch if the protagonist enters the fight with Toriel. If there is still one possible encounter left in the Ruins, the fight with Toriel proceeds as normal for a Neutral route; however, if Toriel is killed, the protagonist continues a Genocide Route.
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Differences
Ruins
After Exhausting Kill Counter
If the protagonist exhausts the kill counter, The Kill Counter appears in the STATS menu.
If the protagonist exhausts the kill counter before finding Napstablook, they vanish when the protagonist approaches them.
The NPCs for Froggit and Vegetoid do not appear.
In Toriel’s Home, if the protagonist checks the kitchen, the flavor text reads “Where are the knives.”
When checking the mirror, the flavor text, “It’s me, <Name>.” appears instead of “It’s you!”
When facing Toriel at the exit of the Ruins, the protagonist kills her with a single attack regardless of your AT.
When attempting to talk to Toriel, the flavor text “Not worth talking to.” appears instead of “Knows best for you” “Ironically, talking does not seem like the solution to this.”
After Killing Toriel
In the next chamber, Flowey identifies the protagonist as the first human.
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Genocide Route (cOnTiNuEd)
Snowdin
Before Meeting Requirements
When encountering Sans, he is disturbed by the fact the protagonist does not react to his joke. He then attempts to hide them behind the conveniently shaped lamp, but they ignore him. Papyrus runs in, and leaves after Sans tells him he found a human and does not notice the protagonist. Sans then tells the protagonist that they should continue pretending to be a human.[3]
Doggo shivers when the protagonist approaches him.
When Papyrus finally notices the protagonist, he initially does not recognize them as a human.
The protagonist can take three snowman pieces from the Snowman until he becomes a “useless pile of snow.”
The protagonist ignores all of Papyrus’s puzzles, and some of them appear to be solved with Flowey’s help.
The protagonist walks through the electricity maze before Papyrus finishes explaining it.
The word search, when checked, has different dialogue.
If the word search is checked and the protagonist interacts with Sans afterward, he remarks that he should have made the puzzle a junior jumble, as opposed to a crossword during a Neutral Route.
The spikes are already retracted for the X –> O puzzles and Papyrus is absent.
The ice bridge for the ice X –> O puzzle is already expanded.
The protagonist cuts off Papyrus’s explanation of the tile puzzle and walks through it before Papyrus can activate it. After ignoring the puzzles, the music changes to a sad tune.
The “gauntlet of deadly terror” is retracted after Papyrus feels like the human would not appreciate it. After Papyrus leaves, Sans warns the protagonist that they will “have a bad time” if they continue the way they are currently going, specifically mentioning the protagonist’s upcoming battle with Papyrus. He then seems to teleport out of the area.
In version 1.000, all of the SAVE points said “That comedian…” after the protagonist passed the bridge gauntlet. According to Toby, the message appearing so often was a bug and was fixed in version 1.001.
The “comedian” is Snowdrake – if Snowdrake is not killed before the counter is exhausted, the SAVE point text changes to “The comedian got away. Failure.” and the Genocide Route is aborted.
After Meeting Requirements
Once the protagonist exhausts the kill counter, all Snowdin NPCs except Monster Kid evacuate.
The protagonist can no longer sleep at the Inn.
Inspecting the Christmas tree at the center of town displays the message “Nothing for you.”
Inspecting the unfinished book in the Snowdin Library yields the message “Some unfinished book.”
A decoy version of the Innkeeper’s Child is present.
Due to the absence of the Snowdin Shopkeeper, the protagonist can steal all of her wares and 758G from the counter.
Papyrus tries to convince the protagonist to be a good person and immediately offers to spare them. Even after being killed, he still believes that the protagonist can do better.
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Waterfall
Before Meeting Requirements
Nearly all of the echo flowers produce a message stating “It’s strangely silent.”
The smiley face is scripted to appear when encountering Aaron.
Encounters are marked by a smiley face above the protagonist’s head as opposed to an exclamation point.
All of the NPCs are absent, except Monster Kid, Gerson, and the Temmie Shopkeeper.
Like Snowdin, most of the puzzles are already completed.
Rocks are not falling down the waterfall in the second room.
The Bridge Seeds are already aligned.
Onionsan does not appear.
When Monster Kid offers to help the protagonist reach the ledge, the protagonist climbs on to the Kid’s shoulders roughly.
The protagonist’s actions upset the Mad Dummy so much that it causes them to become corporeal, turning them into the Glad Dummy. Since the protagonist helped the Mad Dummy become corporeal, they immediately offer to spare them. The dummy must be killed in order for the Genocide Route to progress.
Gerson remains in his shop, and sells his items as usual, albeit with different dialogue.[8] He also appears to have some meta-knowledge, knowing that the protagonist cannot harm him as shopkeepers cannot be fought, and thus their threats mean nothing.
Temmie Village is empty except for the Temmie Shopkeeper, who behaves normally, seemingly unaware of what is happening, and the Temmie that watches the protagonist from within the wall.
The Tem Shop has no option to pay for the shopkeeper’s college education – this is replaced with the option to buy “Premium” Temmie Flakes at a price of 1000G, making it impossible to obtain the Temmie Armor during a Genocide Route.
After Meeting Requirements
The Small Bird does not show up, meaning the player cannot be carried over to go back to any of the areas before.
An additional save point appears before the bridge.
On the bridge, Monster Kid approaches the protagonist, saying that Undyne told them the protagonist had done bad things and began to see the truth in her words. They try to fight the protagonist, but when the protagonist retaliates, Undyne jumps in and takes the fatal hit. Instead of dying, however, she recovers and becomes Undyne the Undying, who is significantly more difficult than the ordinary Undyne boss fight.
After being defeated, Undyne dies with a smile, aware that Alphys is evacuating the monsters ahead of the protagonist, and will tell Asgore to absorb the souls he has collected.
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Genocide Route (cOnTiNuEd cOntInUeD)
Hotland and CORE
Before Meeting Requirements
Alphys is absent in her lab. Instead, Mettaton acknowledges the protagonist’s malice and flees.
The console that shows the protagonist says “It’s me, <Name>.” when interacted with.
The protagonist describes the bag of dog food as “half-empty” (as opposed to “half-full,” if no-one has been killed yet), followed by the message “You just remembered something funny.” when interacted with. This message also appears after killing Lesser Dog, Greater Dog, and Doggo in Snowdin, and having 21+ kills in a Neutral Route.
Upon being inspected, the hole in the wall yields the message “It’s just here to complete the look.”
Like Snowdin and Waterfall, most of the puzzles are deactivated.
Most of the lasers are off, the only exceptions are the first opposing ship puzzle to the left, as soon as the protagonist approaches the laser, it turns off automatically, the other one, the three lasers on conveyor belts are still active, even if the Shoot the opposing ship puzzle is already solved.
The puzzles involving shooting the opposing ship are already solved.
The Royal Guards are encountered much earlier, at the three steam vents before the entrance to Mettaton’s cooking show set, and they attempt to avenge Undyne. They can both be killed in one hit.
Mettaton’s cooking show, news report, and musical performance do not occur.
The elevator in Hotland can access every floor from the start. However, floors L1, L2, and R2 are cut off by force fields, preventing the player from getting the Stained Apron and encountering So Sorry.
Muffet does not show up for her bake sale. It is still possible to buy from the bake sale, but this does not prevent the fight with Muffet.[9] Before she is fought, she does not consider the protagonist to be fit to eat but attempts to dispose of them regardless.
The Muffet fight still takes place, though the protagonist can kill her in a single attack, so long as the attack is well-executed. If not killed immediately, she has unique dialogue referencing the Underground’s evacuation.
She talks about how Alphys unsuccessfully attempted to get the spiders to evacuate.
The telegram she receives states that despite the protagonist being a hyper-violent murderer, they never harmed a spider since there are no other spider enemies.
All of the other NPCs other than Burgerpants are absent.
Due to the absence of Bratty and Catty, the protagonist can steal all of their wares, as well as 5G from their shop. A note can be found which reveals that Alphys came to evacuate them to someplace “super duper safe,” but that Bratty and Catty wanted to use up their gel pens before leaving.
Examining the plant in the MTT Resort reveals that “(The potted plant is judging you for your sins.)”
A box appears in the lobby of MTT Resort.
The elevator in the CORE is functional from the start and can be used to bypass the rest of the CORE.
The monsters that ambush the protagonist near the entrance to the CORE and before the second laser puzzle are absent, though the monsters that ambush the protagonist along the “warrior’s path” are still present.
After Meeting Requirements
The Mettaton encounter at the end of the CORE becomes a face-off against Mettaton NEO. Mettaton dies in a single hit.
The “Welcome to Snowdin Town” sign is removed, although there’s still a solid placeholder upon interacting with the place of the sign.
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Genocide Route (cOnTiNuEd cOntInUeD cOnTiNuEd)
New Home
A slower, lower-pitched version of “Small Shock” plays in place of “Undertale.”
A box appears in the Last Corridor.
The present box in Asgore’s Home that otherwise contains the Worn Dagger now contains the Real Knife, and the text “About time.” displays.
The present box in Asgore’s Home that otherwise contains the Heart Locket now contains The Locket, and the text “Right where it belongs.” displays.
Examining various objects throughout Asgore’s Home yields unique descriptions.
Padlocks, first time, if no keys are used: “He leaves them in the kitchen and the hallway.”
Padlocks, otherwise: “There are two keys.”
Padlocks, while unlocking: “I unlocked the chain.”
Closet: “Our clothes.”
Left bed: “My bed.”
Right bed: “His bed.”
Drawing of flower: “My drawing.”
Bookshelves / Asgore’s closet: “Nothing useful.”
Asgore’s dresser: “Still has that sweater.”
Photograph: “…”
Refrigerator: “No chocolate.”
Kitchen note: “I’ve read this already.”
Journal: “The entries are always the same.”
Stovetop: “Stovetop.”
Mirror: “It’s me, <Name>”
Calendar: “The date I came here.”
While walking through Asgore’s Home, Flowey talks to the protagonist, even if he was killed after the last True Reset.
Flowey’s dialogue in New Home. The lack of name in the bottom left is unedited.
Unlike in other encounters, the fallen human’s name does not appear during the dialogue encounters with Flowey.
He tells the protagonist about his life ever since he was a flower, his own ability to SAVE, and why the protagonist started killing.
He even seems to break the fourth wall and insult “those sickos that stand around and WATCH it happen” (meaning the player, implying that they had no actual interaction with the game and were instead merely a spectator) for not playing the Genocide Route themselves.
Flowey reiterates his “Kill or be killed” mentality, saying that he and the protagonist would not hesitate to kill each other if the need arises. However, he finally realizes, in horror, that he is not above this and that, eventually, the protagonist will kill him. He runs away afterward.
In the Last Corridor, Sans does not judge the protagonist but instead warns them that they will have a bad time. He fights them as an attempt to stop them from destroying the timelines of all worlds. His battle is widely considered to be the most difficult battle in the game, followed by Undyne the Undying.
Within the room with all of the coffins, the red coffin says “It’s as comfortable as it looks.”
Flowey begs for his life as the last enemy on the Genocide Route.
Within the throne room, Asgore mentions having never seen a flower crying (referring to Flowey’s attempts to warn Asgore of the protagonist). The protagonist then proceeds to attack Asgore, killing him in one hit. Flowey finishes Asgore off, and then, with his face and voice turning to Asriel’s, he begs the protagonist not to kill him. This is the final point where the game can be reset without consequences, as pressing any of the action buttons causes the protagonist to kill Flowey.
Instead of leaving the black screen and returning to the Throne Room, a track consisting of high-pitched wailing and echoing heartbeats begins to play as Chara appears on the black screen and talks to someone: either the protagonist or the player directly. The window name becomes blank with no border.
Chara explains that the protagonist’s determination was the reason that the former came back, saying the player taught them the reason for their return, power, and gave them the means to gain it. It was the protagonist’s SOUL and determination that allowed them to destroy everything so that they could achieve this goal. They offer to destroy the world so that the two of them can move on to another world. At this point, two prompts are given: “ERASE” or “DO NOT.”
During this conversation, the player cannot use the ESC button or click the red Close Button. The only way to close the game at this point is through the computer’s Task Manager on Windows or Force Quit on a Mac.
If the player chooses “ERASE,” Chara calls the player “a great partner.” followed by hollow eyes and stating that Chara and the player will be together forever, resulting in the world’s destruction.
Choosing “DO NOT” causes Chara to be seemingly surprised at the player’s refusal, thinking that the player must have misunderstood them. Chara then asks the player “SINCE WHEN WERE YOU THE ONE IN CONTROL?” with hollow eyes, which then results in a jumpscare. Chara then approaches the screen with a horrifying facial expression while apparently laughing, emitting a horrible noise as the screen shakes while flashing red and black.
Following either option, a larger slash animation is seen followed by the screen shaking and filled with “9’s,” resulting in the world’s destruction, and the game closes. In console versions of Undertale, the screen instead blacks out with nothing happening for 30 seconds until howling wind plays.
After the giant slash animation, the entire window of UNDERTALE (in the Windows versions) shakes violently side to side, implying that the attack was damaging the game itself.
The game automatically reverts to Windowed mode during Chara’s jumpscare and the large slash animation.
Other
Misc.
Encounters become considerably harder to find as the protagonist progresses (except New Home).
After killing all monsters in the Ruins, a kill counter is added to the Stats menu.
Various events cause music in Snowdin to revert to its normal state; the music returning to its normal speed does not indicate a failure of the route.
If the kill counter is not yet exhausted for Waterfall, a dialogue box appears between the second and third flowers on the path of Room 131 (room_water19), reading “Strongly felt <number> left. Shouldn’t proceed yet.”.
Several events trigger when Mettaton NEO is defeated:
Encounters no longer occur.
Upon interacting with the lasers button in the beginning of Hotland, the lasers will not be re-activated, and the button will just read: “(Didn’t work.)”
sans. no longer plays at Grillby’s.
Conclusion
And there we have it! A guide/what you need to know about Undertale as you play.
Guide by: Melonverse
Source: Fandom
Goodbye!