Undertale Adventures X Codes (November 2026)

Undertale Adventures X is a tower defense game from Side Productions that drops Undertale units onto a battlefield and asks them to hold the line. Waves of monsters march on your base, your placed units hold them off, and between rounds you level those units up and roll traits onto them so the team can survive the harder waves waiting later.

Both live codes are Halloween event codes, and they are generous. FREETOKENS tops up your Spooky Goodie Bags and Jack-O-Lanterns, while Halloween2026! dumps an entire inventory on you — food, trait rerolls, gold and souls in one claim. Everything working is below, along with the eight codes that have already died.

All New Undertale Adventures X Codes

FREETOKENS: 5x Spooky Goodie Bag, 1500x Jack-O-Lantern. (==NEW==)
Halloween2026!: 3 Cinnamon Bunnies, 5 ???, 1 Pie, 2 Ketchup, 3 Spider Cider, 2 Face Steak, 2 Glamburger, 3 Sea Tea, 3 Nice Cream, 50 Trait Rerolls, 3 Astronaut Food, 3 Starfait, 1 Legendary Hero, 3 Hot Dog, 10 Soul Fragment, 3 Spider Donuts, Jack-O-Tokens, 5 Spooky Goodie Bag, 5 Perfect Soul, 250 Gold, 1,5000 Souls.

Tip: Redeem Halloween2026! before anything else. Event codes are the first to expire when the event ends, and this one is worth 50 Trait Rerolls plus a mountain of items. Type the exclamation mark at the end — it is part of the code, not decoration.

Expired Undertale Adventures X Codes

8KCCU!
4KCCU!
UAXISTHEBESTUTTD
3KCCU!
THANKYOUFORWAITING
TRADINGSOON
MONEYTONIGHT
7KCCU!

How to Redeem Undertale Adventures X Codes

Everything happens through the Codes icon at the side of the screen. Four steps and you are done:

Launch Undertale Adventures X on Roblox.
Click on the Codes icon on the right side of the screen.
Enter a valid code in the text box on the pop-up window.
Press the Enter key to receive all your rewards.

How to Get More Undertale Adventures X Codes

Read the expired list and a pattern jumps out: most dead codes celebrated player-count milestones — 3K, 4K, 7K and 8K CCU — while the live ones arrived with the Halloween event. That makes events and milestone moments the times to watch the game’s Roblox page, where Side Productions posts its announcements. This page is refreshed whenever a new code drops.

Why Are My Undertale Adventures X Codes Not Working?

Code not working? In this game the answer is usually here.

The exclamation mark is part of the code: Nearly every code in Undertale Adventures X ends with one — Halloween2026!, 8KCCU! and the rest. Leave it off, or get the capitals wrong anywhere, and the game reads it as a different code entirely. Copy and paste to be safe.

Milestone codes die fast: The expired section is full of codes that were only ever meant to celebrate a player-count moment, and they were switched off soon after. If a code is typed perfectly and still fails, it has almost certainly been retired — check it against the expired list above.

Already claimed: Codes can be redeemed once per account. The game does not remind you that you used one; it just rejects the repeat attempt.

More Roblox Codes You Should Check Out

Conclusion

That is the state of play for Undertale Adventures X: two Halloween codes still live, eight milestone codes in the ground. Claim the event pair while the event lasts, and look in again when the next event or milestone lands.