Undertale Adventures X takes the monsters, humour and heart of Undertale and rebuilds them as a tower defense. Waves of enemies march on your base, and you hold the line with a squad of familiar faces, levelling them up between rounds and rolling traits to squeeze more out of every unit. It is by Side Productions, and its Halloween event is running right now — the game is even wearing a jack-o’-lantern name tag for the season.
Codes here tend to arrive in short bursts around events, then vanish. The current pair are both Halloween drops, and Halloween2026! in particular is less a code than a care package: food, rerolls, souls and more land in your inventory all at once. Grab both quickly, because this game’s history says event codes do not linger.
All New Undertale Adventures X Codes
- FREETOKENS: 5 Spooky Goodie Bags and 1,500 Jack-O-Lanterns (==NEW==)
- Halloween2026!: 50 Trait Rerolls, a Legendary Hero, Soul Fragments, Perfect Souls, Gold, Souls and a big pile of food and Halloween treats (==NEW==)
Do not sit on the Trait Rerolls from Halloween2026!. Traits are where a mid unit turns into a carry, and fifty free rolls is enough to fix the worst luck on your main damage dealer — spend them there first, then spread what is left around your support units.
Expired Undertale Adventures X Codes
The milestone era is well and truly over — every CCU celebration code and the pre-Halloween strings have stopped working:
- ANOMALOUSEVENT2!!!
- ANOMALOUSEVENT!!!
- 9.5KCCU!!!2026
- 8KCCU!
- 5KCCUREWARD
- 6KCCUREWARD
- PREPAREFORHALLOWEEN
- 4KCCU!
- UAXISTHEBESTUTTD
- 3KCCU!
- THANKYOUFORWAITING
- 2KCCU!
- FREESTUFF!
- TRADINGSOON
- MONEYTONIGHT
- 7KCCU!
How to Redeem Undertale Adventures X Codes
- Launch Undertale Adventures X on Roblox.
- Tap the Codes icon on the right-hand side of the screen.
- Type a working code into the text box in the window that pops up.
- Press Enter and the rewards are added to your account.
How to Get More Undertale Adventures X Codes
Side Productions releases codes in clusters around updates, player-count milestones and seasonal events like the current Halloween celebration, so quiet weeks are normal here. The Side Productions Discord server is where the announcements and codes land first, and the developer’s Roblox group carries the same news. Save yourself the daily checking, though — bookmark this page and we will refresh the list the moment a new code is confirmed working.
Why Are My Undertale Adventures X Codes Not Working?
Double-Check for Typos: Mind the punctuation as much as the letters. Codes in this game end in exclamation marks and mix capitals with numbers, and the game will reject anything that is not an exact match — paste the code in rather than typing it.
The Code Has Expired: Event and milestone codes are switched off once the celebration ends, and they go without notice. The long expired list above shows how quickly this game retires them.
You Already Redeemed It: Every code can only be claimed once per account. If a code looks right and you have played through a previous event, there is a fair chance you collected it back then and simply forgot.
More Roblox Codes You Should Check Out
- 8 Ball X Codes
- Anime Adventures Codes
- Anime Card Adventures Codes
- Anime Celestial X Codes
- Anime Rangers X Codes
Conclusion
Two codes, but one of them is the biggest single drop this game has put out — Halloween2026! alone is worth the thirty seconds it takes to redeem. Claim both while the event is live, put the rerolls to work on your favourite unit, and swing by again when the next milestone rolls around.
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