Undertale-Inspired Tower Defense
Undertale Adventures X Wiki
Defend your base with Undertale units, level up your team and strengthen your fighters with traits in this Roblox tower defense adventure.
- Visits
- 17,411,585
- Favorites
- 35,799
- Playing
- 2,216
As of
As of
As of
Latest codes
As of
2KCCU!— Freebies (Reported by 4 sites)FREESTUFF!— Freebies (Reported by 4 sites)
Latest Guides
Browse All Guides
Meta Team Comp and Best Units Guide
Build the strongest Undertale Adventures X meta team on Roblox using top S-tier towers like Sans, Asriel, Mettaton NEO, Undyne, and Papyrus.
Codes (October 2026) – Working Codes
Undertale Adventures X: 13 displayed codes (2 multi-source reports, 1 reported, 3 disputed, 7 expired or likely expired); last successful source read October 13, 2026. Checked twice daily.
Start Here
Your Undertale Adventures X Journey
Redeem Promo Codes
Claim free trait rerolls, summons, and items through the in-game redemption box.
Build Meta Teams
Assemble a balanced lineup of area damage, boss killers, tanks, and crowd controllers.
Troubleshoot Failed Codes
Review case sensitivity, server desynchronization, and one-time use restrictions for reward codes.
Plan Unit Substitutions
Identify viable A-tier replacements like Asgore, Muffet, and Mettaton EX for your team.
What do you want to do?
Explore the Wiki
Guides & References
Codes (October 2026) – Working Codes
Undertale Adventures X: 13 displayed codes (2 multi-source reports, 1 reported, 3 disputed, 7 expired or likely expired); last successful source read October 13, 2026. Checked twice daily.
Meta Team Comp and Best Units Guide
Build the strongest Undertale Adventures X meta team on Roblox using top S-tier towers like Sans, Asriel, Mettaton NEO, Undyne, and Papyrus.
The Game at a Glance
What is Undertale Adventures X?
Undertale Adventures X is a Roblox strategy tower defense game developed by Side Productions, formerly known as Undertale Adventures TD. Players defend their Underground base against waves of invading monsters using towers and units inspired by Undertale.
During defense runs, players deploy units across functional roles including area damage, tanking, and crowd control. Progression is supported by leveling towers, rolling powerful traits, collecting tokens in Raids mode, and using an AFK Chamber.
Explore All Guides- Developer
- Side Productions
- Platform
- Roblox
- Genre
- Strategy / Tower Defense
- Release Date
- Jul 16, 2024
- Total Visits
- 17.4M+
- Players Online
- 2,239
- Favorites
- 35,797
- Server Size
- 15
Choose Your Topic
Find Your Next Guide
From defending your base to comparing gamepasses, choose the topic you need.
Beginner Guide
Defend your base from monsters using Undertale units in this Roblox tower defense game. Build stronger units by leveling them up and improving them with traits.
Deploy top S-tier characters like Sans, Asriel, Mettaton NEO, Undyne the Undying, and Papyrus.
Cover essential team roles by combining area-of-effect damage, single-target boss killing, frontline tanking, and crowd control.
Strengthen units through leveling up and rolling combat traits to boost baseline stage performance.
More details
Clear Raids mode to collect valuable progression tokens and take advantage of the AFK Chamber.
Gamepasses
Compare the Robux prices of VIP, SHINY Hunter!, Supporter, +50% Tokens, and 2x XP. Supporter includes a 10% summon discount, 15% more Underpass XP, a title, and a chat tag, while +50% Tokens increases currency earned in Raids mode.
The plus fifty percent Tokens gamepass increases currency yields earned specifically from Raids mode.
Tokens gathered from Raids mode provide vital resources required for player roster progression.
The game provides a dedicated AFK Chamber to accumulate resources without running active stages.
Quick Answers
Frequently Asked Questions
What is Undertale Adventures X?
Undertale Adventures X is a Roblox tower defense game by Side Productions where players deploy Undertale-inspired units to defend their Underground base.
Who developed Undertale Adventures X?
Undertale Adventures X was developed by Side Productions and was formerly known as Undertale Adventures TD.
Which units form the meta team in Undertale Adventures X?
The core meta lineup consists of S-tier units: Sans, Asriel, Mettaton NEO, Undyne the Undying, and Papyrus.
What is the best boss-killing unit in Undertale Adventures X?
Mettaton NEO is the premier single-target damage dealer and the top boss killer in the game.
How do you redeem codes in Undertale Adventures X?
Click the Codes button on the right side of the screen, enter the code in the text box, and press Redeem.
What does the AFK Chamber do in Undertale Adventures X?
The AFK Chamber allows players to gather progression resources passively while away from active defense runs.
Where will you start?
Choose your starter units, learn how traits work, or prepare your team for raids.
Undertale Adventures X · Platform: Roblox · Developer: Side Productions
Keep exploring
Codes (October 2026) – Working Codes
Undertale Adventures X: 13 displayed codes (2 multi-source reports, 1 reported, 3 disputed, 7 expired or likely expired); last successful source read October 13, 2026. Checked twice daily.
Meta Team Comp and Best Units Guide
Build the strongest Undertale Adventures X meta team on Roblox using top S-tier towers like Sans, Asriel, Mettaton NEO, Undyne, and Papyrus.