Beginner

Clear your first defense

How a first defense works: what the October 2026 Roblox listing confirms, and which placement, money, and difficulty rules come from 2024 footage.

Clear your first defense

How a first defense works: what the October 2026 Roblox listing confirms, and which placement, money, and difficulty rules come from 2024 footage.

A first clear is the job. The public listing only promises a tower defense game: place Undertale-inspired units, level them, and add traits. Everything below the listing facts comes from 2024 match footage and a September 24, 2024 beginner write-up of this experience. The Roblox record changed on October 12, 2026 without patch notes, so if a button on your screen disagrees with this page, follow the screen.

What the current listing confirms

  • Developer: Side Productions.
  • Created: July 16, 2024. Place id 18512318831. Server size 15.
  • Genre: Strategy / Tower Defense.
  • The listing has no paid entry price.
  • The description still says to defend with units, level them, and strengthen them with traits.

What a 2024 match actually used

A September 24, 2024 beginner guide and August 2024 footage of this place describe the same loop:

  1. You start a stage with a limited purse.
  2. You place units. The same unit can be placed more than once. That guide described a party of five.
  3. Defeated enemies pay more money, which you spend on more placements or on upgrades.
  4. Clearing a stage pays XP, Souls, and other resources. Souls are what that guide said you spend to summon more units.
  5. The game starts you with a small set of units. The September 2024 guide said two default units, then summons and drops.

Controls listed in that guide are the usual Roblox set: W, A, S, D to move, Space to jump, E to interact.

Difficulties

August and September 2024 footage shows players voting Neutral or Genocide before a match. The September 24, 2024 guide also names Pacifist as the easiest of three, Neutral as the middle, and Genocide as the hardest. Use Neutral for a normal first clear unless your lobby no longer shows that name.

A first-match order

  1. Place one unit that can hit the opening enemies. Do not spend the whole purse on bodies you cannot upgrade.
  2. Upgrade the unit that is landing hits.
  3. Add a second role only when something leaks. Area damage helps when enemies clump. A slower or a tougher unit helps when enemies walk through the damage.
  4. Stop adding copies once the wave is dying with money left over. Bank that money for the next spike instead of filling every tile.
  5. After the clear, spend Souls on a summon only if you still lack a second role. Leveling a unit you already use is the step the current listing still names.

Where this stops

Starting cash, party size, and difficulty names were not restated on the October 2026 listing. Infinite mode was described in the September 2024 guide as an endless score run. It was not mentioned on the current listing. Treat both as 2024 systems until you see them in the lobby.

Next, open Traits and rerolls before you spend rerolls, then Team roles once you can field more than a starter.

FAQ

Frequently Asked Questions

What is Undertale Adventures X?

It is a free Roblox tower defense experience by Side Productions. You defend a base with Undertale-inspired units, level those units, and strengthen them with traits. The experience was created on July 16, 2024, and the public record was updated on October 12, 2026.

Is Undertale Adventures X free?

The Roblox listing has no paid entry price. Optional Robux gamepasses exist. Known names include VIP, SHINY Hunter!, Supporter, +50% Tokens, and 2x XP. Current Robux prices were not on the public listing text used here.

Who makes the game?

Side Productions, the verified Roblox community that owns the experience. The community page is linked from the game listing.

How do codes work?

Open the Codes button on the right side of the screen, enter the full string, and press Enter or Redeem. Only 2KCCU! and FREESTUFF! were still reported working in October 2026, and both rewards were described only as freebies.

Do trait rates still match the old table?

Trait rerolls assign one of 12 listed traits. The rate table matches an August 2024 odds screen for Royal Guard Soul at 15%, and a November 29, 2024 video described the Perseverance buff the table now shows. Read the percent in your own Traits menu before you spend a large stack of rerolls.