Undertale Adventures Codes

Redeem the codes below for free in-game rewards in Undertale Adventures. We verify every code before posting and re-check daily.

Working

3 codes

Last checked

May 19, 2026

Active Undertale Adventures Codes 3

Code	Description	Status
New UPDATEJUNE10	Free Reward	Active
HOTLANDS2025	Free Reward	Active
XMASUPDATE2025	1 Reroll	Active

How to redeem codes

To redeem codes in Undertale Adventures, open the in-game menu from the lobby interface and find the codes button. Enter your code and confirm to receive your Rerolls. Codes are case-sensitive in many tower defense games, so enter them exactly as shown.

Rerolls are the primary reward from codes in Undertale Adventures, and they are the most valuable resource for optimizing your units. Each Reroll randomizes a unit's traits - the random stat modifiers that can dramatically change how effective a unit is in battle. A code giving 30 Trait Rerolls is a significant resource for players trying to build a strong defensive lineup.

Side Productions releases codes alongside major content updates and seasonal events. Update codes are named after the content they accompany (Hotlands, Christmas, June 10 update), so new zones and events are your signal to look for new codes. The primary announcement channel is Side Productions' Discord server, which is the fastest source for new code drops. Codes can expire between updates, so redeem them promptly when a new one is announced.

Undertale Adventures Codes FAQ

Everything you need to know about Undertale Adventures codes - from redemption to why they sometimes don't work.

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How do I redeem codes in Undertale Adventures?

Open the in-game menu from the lobby interface and find the codes button. Enter your code exactly as shown - codes are case-sensitive - and confirm to receive your Rerolls.

Why isn't my Undertale Adventures code working?

The code may have expired between updates, been typed with incorrect capitalization, or already been redeemed on your account. Undertale Adventures codes are released around specific updates and can expire after that content cycle. Check the Side Productions Discord for the current active code list.

What do Undertale Adventures codes give you?

Undertale Adventures codes primarily give Rerolls - consumable items used to randomize unit traits. Trait Rerolls are the most valuable resource for competitive players, as optimizing traits can dramatically improve a unit's effectiveness in battle. Some codes have given 30 or more Trait Rerolls.

Where do I find new Undertale Adventures codes?

Side Productions announces new codes on their Discord server, which is the fastest and most reliable source. Codes are also sometimes posted in the game description on Roblox. Major content updates and seasonal events like Christmas and the Hotlands zone release are the most common occasions for new codes.