How to get the True Pacifist ending in Undertale
Follow the no-EXP route, complete friendships and continue after the required Neutral ending.
Original PC Undertale, normal mode. Console-exclusive content, Deltarune and the unfinished Hard Mode are outside scope. Route guides contain progression spoilers; the character guide avoids late-game identity reveals.
Keep EXP at zero and complete Neutral first
True Pacifist requires a completed Neutral ending and a run with no EXP gained. On a fresh file, your peaceful first journey still reaches the Neutral sequence. After finishing it, reload your SAVE and continue the missing friendship steps if your run remains eligible; you do not automatically need to start over.
Befriend Papyrus and help Undyne
After sparing Papyrus, visit his house and complete the date or hangout. During the later Undyne pursuit, flee when your heart is red and continue toward Hotland. When she collapses, use the nearby water cooler to give her water before leaving. Then return to her Waterfall house for the hangout with Papyrus’s help.
Deliver the letter and follow the call
After the required Neutral completion and friendships, backtrack toward MTT Resort to trigger Undyne’s call, then collect her letter outside Papyrus’s home. If you complete her hangout after defeating Omega Flowey and the current run’s Mettaton EX, she can instead give the letter immediately at her house if you have inventory space. Deliver it at Alphys’s lab and complete the date.
Return to the laboratory for the final branch
Follow the subsequent phone guidance back to Alphys’s lab and investigate the note and bathroom entrance. The True Lab requires four colored keys and power restoration before the ending route continues. Bring healing items before entering. This stage locks you into a substantial sequence, so finish any desired ordinary shopping beforehand.
More Undertale quick answers
How to spare Toriel in Undertale without attackingUndertale blue and orange attacks: when to move and when to stopIf you gained EXP or left the collapsed Undyne without water, backtracking alone cannot repair that run for True Pacifist.
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