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how to get true pacifist ending

To get the True Pacifist ending in Undertale, you must (1) never kill anyone, (2) build key friendships, and (3) finish a Neutral run first, then reload your save to unlock extra late-game content that leads to the final boss and happy credits.

How to Get the True Pacifist Ending

1. Core Requirements (No-Kill + Route Setup)

You need to meet some strict conditions across your entire playthrough.

  • Do not kill any monsters.
    • Always use ACT and then SPARE , or FLEE when allowed.
* Even one kill will lock out the standard True Pacifist route for that file.
  • Finish at least one Neutral run first.
    • Undertale forces your very first completion to be Neutral, even if you are fully pacifist.
* After seeing the Neutral ending (Omega Flowey / Photoshop Flowey), reload your save to unlock the new content that leads to True Pacifist.
  • Avoid a full Genocide route on that file.
    • A completed Genocide run replaces normal True Pacifist with the so‑called Soulless True Pacifist ending.

2. Area-by-Area Checklist

Ruins

Goal: Leave without killing anything and keep Toriel alive.

  • Learn to ACT + SPARE on basic monsters (e.g., compliment Froggit, then spare).
  • In the fight with Toriel , keep sparing over and over; she will eventually stop fighting and let you go.
  • Do not grind for EXP; if your LV ever rises above 1, you killed someone somewhere.

Snowdin

You must befriend Papyrus.

  • Fight Papyrus without attacking to kill.
    • Let his attacks hit minimal damage or dodge them, and choose SPARE repeatedly until he gives up and “captures” you in his garage, then gives up entirely.
  • After his battle, go to Papyrus’ house in Snowdin and accept his invitation.
    • Complete his goofy date/hangout sequence in his kitchen and bedroom.
* This date is mandatory for the True Pacifist route.

Waterfall

Here you secure another crucial friendship: Undyne.

  • In the chase sequences and the eventual Undyne fight:
    • When your soul is red , you can choose to FLEE instead of killing her.
  • After the last chase, Undyne collapses near Hotland.
    • Use the water cooler right there and give her water.
* If you walk away or leave the screen without helping, the Pacifist route can be locked.

Later, you’ll get the chance to hang out/date Undyne , but this is triggered only if:

  • You dated Papyrus already, and
  • You gave Undyne water.

Hotland & Core

You continue sparing everyone and setting up Alphys’ arc.

  • Spare all standard enemies and Mettaton EX.
    • Mettaton’s battle is a show‑rating fight; you want to raise ratings instead of killing.
    • The stick (your starting weapon) can be used on him for a big rating boost (about 1400 points), helping you hit the 10,000 rating needed to end the fight peacefully.
  • Stock up on healing & defense items:
    • Sans’ hotdogs in Hotland heal around 20 HP and are solid for tougher fights.
* The **Old Tutu** behind the waterfall gives +10 DEF, useful because your HP will stay low in a no‑EXP run.

New Content After Neutral Ending

Once you have:

  • Killed no one,
  • Befriended Papyrus (date at his house),
  • Given Undyne water,
  • Possibly done Undyne’s hangout,
  • Reached and beaten Asgore and Omega Flowey for a Neutral ending,

…then reload your save. Now you must:

  • Receive Undyne’s call near the entrance to the CORE or around that part of the game.
  • Follow Undyne’s instructions to go to her house for a hangout/date.
    • This is required to move on to the next friendship step with Alphys.

Next, you’ll be funneled into befriending Alphys :

  • Return to Alphys’ lab in Hotland.
    • You’ll trigger a new sequence involving True Laboratory.
  • Explore the True Laboratory :
    • Spare all the Amalgamates you encounter.
* Read Alphys’ notes, complete the puzzles, and restore power.

After finishing True Lab, go back toward the castle and Asgore to reach the new final path.

3. Boss-Specific Tips (Staying Pacifist)

Asgore

Even in a pacifist run, you must fight Asgore at first.

  • You can’t use MERCY at the start; just attack enough to lower his HP and push the fight forward.
  • Eventually, you’ll get a special interaction and a cracked MERCY button.
    • Click the cracked MERCY button instead of going for a killing blow.
* Sparing Asgore is required for True Pacifist.

Omega Flowey (Photoshop Flowey)

  • This fight appears in your Neutral completion.
  • You’re allowed to attack here; it does not break Pacifist requirements as long as you haven’t killed anyone else.
  • After defeating him, you can choose to spare or kill Flowey:
    • Sparing Flowey gives extra hints about how to reach the True Pacifist route later.

Final True Pacifist Boss (Asriel / final Flowey form)

The True Pacifist final battle is intense but unwinnable in the normal sense.

  • You can’t permanently die here; the game keeps reviving you.
  • Focus on dodging , using HOPE and DREAM options:
    • HOPE boosts defense.
    • DREAM gives you items and healing related to your determination.
  • Do not attack ; instead, use the SAVE option to rescue your friends’ souls by restoring their memories.
  • When you’ve saved all your friends, you’ll get the opportunity to show mercy and complete the True Pacifist ending.

4. Friendship Chain (Dates & Hangouts)

A lot of people miss True Pacifist because they skip the friendship events.

You need this chain:

  1. Papyrus date/hangout
    • After his boss fight, visit his house in Snowdin.
  2. Give Undyne water
    • Right after her collapsing scene near Hotland.
  1. Undyne date/hangout
    • Triggered later via a call/letter once you’ve done Papyrus’ date and given her water.
  1. Alphys date / lab events
    • Return to Alphys’ lab after your Neutral completion and previous dates; this leads to the True Lab sequence.

Complete all of these in the same no‑kill run.

5. Items Worth Holding

You don’t have to min‑max, but certain items make the Pacifist path smoother.

  • Butterscotch Pie (from Toriel)
    • Extremely strong heal and has special effects in later fights.
  • Spider Donut / Cider (Spider Bake Sale)
    • Using one in the Muffet fight lets you spare her instantly.
  • Stick (starting weapon)
    • Huge rating boost in the Mettaton EX fight, making a peaceful resolution easier.
  • Old Tutu and good armor
    • Found behind the waterfall, grants 10 DEF, great for your low‑LV run.

6. Simple Route Recap

If you just want a quick mental checklist for “how to get true pacifist ending”:

  1. Play from the beginning, never kill anyone, keep LV at 1.
  2. Spare Toriel in Ruins.
  3. Spare Papyrus and date him at his house.
  4. Spare Undyne , flee when your heart is red, then give her water when she collapses.
  5. Later, hang out/date Undyne when prompted.
  6. Always spare bosses like Muffet, Mettaton EX, and Asgore (use MERCY when it appears).
  7. Defeat Omega Flowey for a Neutral ending , then reload your file.
  8. Follow Undyne’s message, finish her hangout (if not yet), then go to Alphys’ lab.
  9. Complete the True Lab , sparing all Amalgamates.
  10. Return to the castle, reach the new final boss, use HOPE, DREAM, and SAVE your friends , and never attack in the final phase.

Do all that in one continuous file and you’ll get Undertale’s True Pacifist ending, complete with the full special credits and the happiest possible conclusion.

Information gathered from public forums or data available on the internet and portrayed here.