Undertale Adventures TD vs X: What Changed

If you searched for Undertale Adventures TD and landed on a game called Undertale Adventures X, you are in the right place. It is the same Roblox experience, renamed. The place ID is unchanged, the developer is unchanged and your progress is unchanged. What changed is the name on the store page, and that has real consequences for old codes and old guides.

• Same game — placeId 18512318831, universeId 6272727021
• Same developer — Side Productions, groupId 34323581
• Old name — Undertale Adventures TD
• New name — Undertale Adventures X
• Renamed — in October 2026, exact date not confirmed
• Old codes — the TD-era strings are expired

The Evidence That It Is the Same Game

Three identifiers settle it:

1. The place ID. The game lives at roblox.com/games/18512318831/Undertale-Adventures-X. Roblox place IDs are permanent; a rename changes the slug, not the ID.
2. The universe ID. 6272727021 is the same universe that the older coverage refers to when it writes about Undertale Adventures TD.
3. The group. Side Productions, groupId 34323581, has 82,095 members and a Roblox verification badge. The same group owns the renamed experience.

So when a guide says "Undertale Adventures TD" and a store page says "Undertale Adventures X," they are describing one game at two points in its life.

Why the Rename Matters for Codes

This is the practical consequence. Codes are tied to a game's name only in the sense that players search for them by name; the redeem strings themselves are tied to the place.

That means:

• TD-era codes do not transfer automatically. The expired list includes UAXISTHEBESTUTTD, which is a TD-era string — note the UTTD suffix. It is dead.
• New codes use the X name. MOREFREESTUFF and the KCCU! family are X-era strings.
• Searching "Undertale Adventures TD codes" still works, but the results are a mix of old and new, so the date on a code list matters more than usual.

The full current list is on the codes page, along with the expiry status of every known string.

What Actually Changed Besides the Name

The rename came with content. The community picture in October 2026 is:

• New towers. Community videos showcase new battlepass towers in the current build.
• A new progression push. Whether that is a formal battlepass is unconfirmed — a third-party wiki states plainly that no official battlepass system is documented as of October 15, 2026.
• A traffic peak. The game's visits passed 18.7 million by October 18, 2026, and it was running around 5,658 concurrent players at the time of writing.

What is not confirmed: a specific patch note, an official announcement of what the rename means, or a date. The game's description simply reads "UNDERTALE ADVENTURES X IS NOW LIVE."

That is why this page avoids claiming a feature list. The rename is verified; the contents of the update are only partially verified.

What Did Not Change

Four things are stable and worth knowing:

The structure. Acts 1–6 across Ruins, Snowdin, Waterfall, Hotland, CORE and the Corridor. The zones guide has the order and the bonuses.

The economy. 50 Souls, 5 Underpass XP and 10 Gold per Act, with 75 Souls in the Corridor. The Souls guide has the table.

The Unit roster. Sans variants still occupy the top bands, and the six rarity tiers are unchanged.

The passes. VIP, SHINY Hunter, Supporter, +50% Tokens and 2x XP are the same five purchasable passes.

Searching Under Both Names

Because the rename is recent, the search results are split. Both queries are worth using:

• "Undertale Adventures X" returns current guides, current codes and the current store page.
• "Undertale Adventures TD" returns older guides that are still structurally correct — the Acts, the economy and the Unit bands did not change — but whose code lists are stale.

The rule of thumb: use X for anything time-sensitive, and TD for background on mechanics that predate October.

That also means old YouTube tutorials are still useful. A video from six months ago teaching you how to place a Unit and when to upgrade is teaching mechanics that the rename did not touch. The only parts to ignore are the specific units and codes it mentions.

The Copyright Question

Undertale is Toby Fox's work, and Undertale Adventures X is a fan-made tower defense built on it. It is not an officially licensed product.

That is worth saying plainly because it has a practical implication: the game has operated for more than two years and passed 18.7 million visits without being taken down, which is a strong signal that it is tolerated. But it is not a guarantee, and a fan project's longevity is ultimately not in its own hands.

For players, the practical advice is to enjoy it and not to build a spending plan around it. For guide readers, it means any source describing this game as "official" is wrong.

What to Read Next

If you are new after the rename, start with the beginner guide. If you are returning after a break, the units list will show you what has been added since the roster you remember.

Sources and Further Reading

• The TD-era code page that still ranks for the old name: TryHardGuides' TD-era code page
• The X-era code list and redeem steps: Eurogamer's Undertale Adventures X code page

Official source: Undertale Adventures X on Roblox — the official page carries the current name, and the place ID confirms continuity with the TD-era game.

Frequently Asked Questions

Is Undertale Adventures TD the same as Undertale Adventures X? Yes. It is the same Roblox place, renamed in October 2026.

Do old TD codes still work? No. The TD-era strings, including UAXISTHEBESTUTTD, are on the expired list.

Did the rename reset progress? No. Progress is tied to the place and your account, and the place ID did not change.

Is Undertale Adventures X a sequel? No. It is a rebrand of the same game.

Is it official? No. It is a fan-made tower defense based on Undertale, which is Toby Fox's property.

Which name should I search? Both. Use X for codes and current news, TD for older mechanical guides whose fundamentals are still accurate.