Undertale Adventures X Codes

A tower defense game on Roblox built on Undertale characters — defend your base with Sans, Papyrus and friends, level up units and roll traits. Codes hand out free souls to summon with.

Free souls codes Case-sensitive Updated October 2026
Open Undertale Adventures X Codes button is on the right side of the screen
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The newest confirmed code is PREPAREFORHALLOWEEN (dropped October 17), plus milestone codes 5KCCUREWARD and 6KCCUREWARD. Several older codes circulating online are reported but unverified — try them anyway, they're listed below.

Working codes

Enter exactly as written — punctuation and caps count.

PREPAREFORHALLOWEENNew Oct 17 — event reward
5KCCUREWARDMilestone souls
6KCCUREWARDMilestone souls
MOREFREESTUFF~1,000 souls

Reported — worth trying

Sources disagree whether these still work; none will hurt to attempt.

2KCCU!Earlier milestone
FREESTUFF!Souls
UPDATEJUNE10Update code
UPDSEP25!September update
XMASUPDATE2025Holiday update
SORRYAFTERTALEDELAYDelay apology code

How to redeem

  1. 1
    Launch the game

    Undertale Adventures X by Side Productions — the tower defense one, not an Undertale RPG.

  2. 2
    Find the Codes button

    On the right side of the screen in the lobby — opens the code entry box.

  3. 3
    Paste and confirm

    Souls land instantly; spend them on summons for new units or trait rerolls.

Where codes drop: Side Productions posts new codes in the game's Discord and on the Roblox page around milestones (CCU counts) and updates — milestone codes like the CCU series are the most reliable pattern.