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* kid, listen. there are spoilers on this page; be careful when you're reading.

* you don't want a bad time, do ya?

To access the story, click here.

For one definition of the "No Mercy Route," where all encountered monsters are killed, see Leaderless Ending.

" if you keep going the way you are now...


you're gonna have a bad time."
Sans in Snowdin Forest

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.


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.


  • 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.
    • 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.

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' 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.



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 "Ironically, talking does not seem like the solution to this."

After Killing Toriel


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.
  • 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.


Before Meeting Requirements

  • Nearly all of the echo flowers produce a message stating "It's strangely silent."
  • 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. 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 [[1]] is evacuating the monsters ahead of the protagonist, and will tell Asgore to absorb the souls he has collected.

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. 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.

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.
  • 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."
    • 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.


  • 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.)"
    • [[2]] no longer plays at Grillby's.
    • The lasers in the conveyor belts are deactivated.
  • In the PS4 and PS Vita versions, borders are immediately disabled when the protagonist engages Asgore.
  • The tracks of Hotland and CORE undo the effect of the slowed down Your Best Friend, even if the encounters are triggered.


The Genocide Route ends if the protagonist either completes an area by sparing the boss or reaches certain points in the game without exhausting the kill counter. Future areas appear as though in a Neutral Route, but any previous areas remain affected by the Genocide Route attempt.

  • If the Genocide Route is ended by sparing Papyrus, then the protagonist may only hang out with him as they cannot flirt with him during the battle. Sans is at his post in Waterfall, thanking the protagonist.
  • Sparing Monster Kid results in the game entering the Neutral Route, and the protagonist can fight Undyne normally.
  • There is a specific neutral ending that can be gained by entering the Neutral Route at Mettaton NEO by not killing every monster in the Hotland and CORE before the fight. Mettaton tells the protagonist that they were "holding back" after taking (significantly lower) damage from the protagonist, exploding after his speech. In the ending's phone call, Sans hands the phone to Alphys.
  • If the Genocide Route is ended by sparing Muffet before facing Mettaton, the protagonist enters the Neutral Route, however, NPCs in Hotland still do not appear, including Muffet herself after being spared. This also leads to Alphys's ending.
  • If the Genocide Route is aborted before going to New Home and Flowey is spared, Flowey chastises the player for killing other monsters and requests them to reset the game and replay the entire Neutral Route without killing monsters.
  • If the Genocide Route is aborted midway through and Flowey is spared, Flowey chastises the player for aborting the Genocide Route before asserting that they just wanted to see what peace was like before taking it all away. At the beginning of the next playthrough, Flowey wonders why the protagonist had reset before telling them to do whatever they want.
  • If the protagonist has gone past the point of no return in a Genocide Route (Mettaton NEO fight), they can simply reset their game as long as they do not give an answer to the final question from Chara.

Post-Genocide Game

Upon relaunching the game, only a black screen with howling wind appears, and the game's window is unnamed. Inputs do nothing, and the player must wait ten minutes before Chara addresses them.

Chara reminds the player that they destroyed the world and then questions if the player thinks they are above consequences.

  • If the player confirms by selecting "YES," Chara simply says, "Exactly."
  • If the player selects "NO," Chara asks them, "Then what are you looking for?"

Chara suggests that they could compromise and that they will bring back the world in exchange for the protagonist's SOUL. If the player agrees to this exchange, the game closes and appears to load normally the next time it is opened, while the PS4 and PS Vita versions will immediately reset. If the player declines the offer, Chara leaves the player and does not reappear unless the game is restarted and the player waits for ten more minutes. Chara then offers the deal again.

Once the offer is accepted, the game closes. When re-opened, the game functions as if the player just installed the game, as a naming prompt is given. All future True Pacifist and Genocide endings are altered. Neutral Route endings remain unchanged. Routes completed after the player sells their SOUL are often referred to as "soulless" routes (i.e., "Soulless True Pacifist Route"). A "true reset" is also available after this offer, which erases everyone's memory, and hence the player fights Photoshop Flowey on the next Neutral Route gameplay if it is used.


  • At the end of the Soulless True Pacifist Route, Chara appears to have taken over Frisk's body.
    • If Frisk chooses to stay with Toriel, when the latter leaves a piece of pie before leaving the room, after four seconds they turn over in bed in the final scene and face the camera to reveal Chara with red eyes having taken full possession of Frisk. A lower-pitched version of Flowey's laugh plays to accompany this reveal.
    • If Frisk says they "have places to go," the photograph of Frisk and friends shown in the final scene changes – Frisk is replaced with Chara, and the faces of all the other characters have been crossed out with a red X.
    • "The End" text changes from white (or yellow) to red, and the Annoying Dog does not show up to sleep under the text. The track Anticipation plays extremely slowly three seconds after the "THE END" text appears.
  • At the end of another Genocide ending:
    • Chara calls themself "The demon that comes when people call its name." It does not matter when and where, that time after time, they will appear, and with the player's help, they will eradicate the enemy and become strong. Chara then lists the various stats that the player increases throughout the game as the very feeling they have whenever they are increased. Chara then comments that they and the player are not the same, stating that the protagonist's SOUL has twisted feelings they no longer understand. Chara then wonders why the player continues to recreate the world, and why they continue to destroy it. Chara then states that the player is wracked with a "perverted sentimentality." Chara then suggests that should they recreate the world once again, a different course of action would be advised.
      • The same dialogue occurs even after doing the Genocide ending more than twice.
    • If the player selects "DO NOT" this time, Chara points out that this very feeling is what they had been talking about. Chara then comments to the player that unfortunately, regarding their choice, "YOU MADE YOUR CHOICE LONG AGO." This causes another jumpscare, and once again closes the game.
    • However, no black abyss appears once the player reopens the game. Instead, the regular title screen plays as if the game was reset.
    • In the PS4 and PS Vita versions, after the world is destroyed again, the game does not close, and instead the screen blacks out for about 30 seconds before the regular title screen plays again.

Consequence Avoidance

 Save Locations

Default save locations are as follows:

  • Windows:
    • Windows XP: %SystemDrive%/Documents and Settings/%USERNAME%/Local/Application Data/UNDERTALE
    • Windows Vista/7/8/10: %LOCALAPPDATA%/UNDERTALE
  • Linux:
    • DRM-free: ~/.config/UNDERTALE_linux
    • Steam: ~/.config/UNDERTALE_linux_steamver
    • Steam (later versions): ~/.config/UNDERTALE
  • Mac: ~/Library/Application Support/com.tobyfox.undertale/

Modifying/Deleting Files

To return to a playable state, the player can enter their save data folder and either:

  • Delete the last directory in the aforementioned save location for your respective system; this removes everything you have done in the game as if it is your first time playing it
  • Delete or rename the files system_information_962 and system_information_963 in the aforementioned save location. This removes any effects of having done the Genocide Route. The system_information_962 file is the one that you have erased the world, and system_information_963 is when you have sold your soul.
  • Uninstall the game and do a fresh reinstall.

GOG players using GOG Galaxy may need to disable cloud saving before carrying out any of these steps. Also, these methods are not sufficient for players of the Steam version, as the Steam Cloud backs up the acquisition of the system_information files and restores them if deleted (even if cloud synchronization is disabled). Players of the Steam version will have to render the system_information files unreadable by Undertale by modifying their security settings under file properties to deny read permission.


After completing a Genocide playthrough In the Undertale Demo, the ending screen appears with red text that reads "That was fun. Let's finish the job." replacing the credits while playing Anticipation at a very slow speed. Also, all the pages of the manual but the first and last are replaced with said ending screen, and the last page is replaced with a picture of a faceless Flowey.


  • Since Mettaton NEO lacks attacks in his battle, and Alphys does not encounter the protagonist during this route, Yellow Mode is not used, making it the only SOUL Mode that does not make an appearance during this route.
  • The Ruins is the only area that does not have a slowed down song (except Home), nor solved puzzles, as the Genocide Route was not initiated yet.
  • Before Undyne dies on the Genocide Route, she states that Alphys had told Asgore to absorb the six human SOULs, but when the protagonist encounters Asgore, he has not.
    • Evident by Asgore's lack of urgency at the end of the route, it is possible any message sent to him warning of the human was intercepted.
  • Papyrus is the only character in the game to continue to believe the protagonist can "do better" and redeem themself for the greater good after the genocide of Snowdin and dying to the protagonist.
    • He is also the only main character in the game that does not attack the protagonist despite the latter committing genocide and Papyrus attacking the protagonist on the Neutral Route.