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UNDERTALE WIKI

True Pacifist Route Checklist

· Updated: October 10, 2026

Guides

True Pacifist Route Checklist covers the peaceful ending players ask about most on Steam and forums. Spoilers for late friendships and the True Lab ahead.

Hard requirements

  • Complete a Neutral ending at least once (Asgore + Omega Flowey sequence).
  • Gain zero EXP / LV for the whole run you want to convert into Pacifist.
  • Befriend Papyrus (date / hangout at his house).
  • Befriend Undyne (pour water after the chase, then hang out at her house).
  • Deliver Undyne’s letter and complete the Alphys date.
  • Enter and finish the True Lab.

Efficient path after Neutral

If your Neutral save already has zero EXP, reload that SAVE instead of starting over. Backtrack toward the bridge between the CORE and MTT Resort. When flags are ready, Undyne calls about a letter. Pick it up, slide it under Alphys’s lab door, finish the date, then return to the lab bathroom elevator for the True Lab.

Common failures

  • You killed even one regular monster → True Pacifist is locked; reset a clean run.
  • You skipped watering Undyne → her house stay fails.
  • You never dated Papyrus → Undyne hangout may not unlock properly.
  • Inventory full when receiving the letter → free a slot or check Snowdin later.

After True Lab

The path into New Home locks for the finale. Stock healing items before you enter if you can; the closing sequence is about patterns and choices more than grinding LV.