Undertale Adventures X Raid Act 3: Mode Guide, Units & Token Tips

Undertale Adventures X Raid Act 3 is the checkpoint where casual Raids farming stops being casual. It is the third tier of the game's raid progression, and community reports consistently describe it as the point where enemy waves get tanky enough that a random S-tier lineup is no longer enough on its own. If your clears keep stalling out, the problem is usually role balance and trait rolls rather than raw unit rarity. This guide to Undertale Adventures X Raid Act 3 covers how the act works, which units fill each job, and how to turn repeat clears into steady Tokens.

What Is Undertale Adventures X Raid Act 3?

Undertale Adventures X is a Roblox strategy tower defense game from developer Side Productions. It launched on July 16, 2024, under the earlier name Undertale Adventures TD, and has since grown past 17.4 million visits. You build a team of Undertale-inspired units, place them along a defense path, and hold your Underground base against waves of invading monsters.

Raids mode is the game's dedicated progression grind. Instead of pushing story stages, you clear raid acts for Tokens — the currency that funds the rest of your roster. The acts are sequential tiers, and Act 3 is the third of them. In practice, that means the enemy waves have scaled past the point where a fresh, unleveled team can coast through on placement alone.

If you have never played a Roblox tower defense before, it helps to know that the platform itself is free to join through the official Roblox site — the game is a separate experience hosted there.

How Raid Acts Work in Undertale Adventures X

Every raid act runs on the same loop: pick the act, lock in your saved team, survive the wave count, kill the act boss, and collect your payout. What changes between acts is how punishing each phase is. Early acts let you get away with one strong carry and a few filler units. Later acts, including Undertale Adventures X Raid Act 3, punish that approach because the waves split your attention and your damage.

Community reports describe the difficulty curve of the acts in three broad beats: trash waves test your area-of-effect coverage, armored or high-HP waves test single-target damage, and the boss phase tests whether you actually brought a dedicated killer. Balance patches shift the exact numbers, so treat the table below as a pattern rather than a fixed spec.

Why Act 3 Feels Like a Wall

Most players who stall on Act 3 are not short on rare units. They are short on one of three things: a unit that deletes the boss, a unit that survives long enough for that damage to land, or enough levels for either of those units to matter. Fixing one of those three usually converts a loss into a clear.

Best Units and Team Comps for Undertale Adventures X Raid Act 3

The community tier lists are fairly consistent about the S-tier core: Sans, Asriel, Mettaton NEO, Undyne the Undying, and Papyrus. Rarity is not the whole story, though. What matters in Act 3 is whether every slot has a clear job. The game does not label units by role, so the assignments below reflect how players typically slot them — your build and the current patch can change the fit.

Mettaton NEO is the one pick the community is most unified on: he is widely regarded as the premier single-target damage dealer and the top boss killer in the game. If you own exactly one S-tier unit and you are pushing Act 3, that is the one to level first.

A Team Template That Covers Every Job

You do not need five S-tier units to clear. You need five units that do five different things. A team of three damage dealers and two more damage dealers will lose to a team with one tank, one support, and a focused boss killer.

Preparation Checklist: Traits, Levels, and Positioning

Leveling and trait rolling are where most of your Act 3 power actually comes from. Strengthening units through leveling raises their baseline stats, while rolling combat traits adds a second layer of performance on top. The order you do these in matters more than most players expect.

Common Mistakes and How to Fix Them

Tokens, Rewards, and the AFK Chamber

Tokens are the reason Raids mode exists. They come out of raid clears and feed directly into player roster progression — levels, rolls, and the units that make Act 3 survivable in the first place. That makes Raids the loop that pays for everything else, and it makes Act 3 worth farming once you can clear it reliably.

The plus-fifty-percent Tokens gamepass is the only purchase that directly targets Raids income, and it is not required to clear anything — it just shortens the grind. The AFK Chamber is the free alternative: it accumulates resources without you running active stages, so it is worth checking before and after every session.

For a deeper look at unit stats and tier discussions, the community wiki at Undertale Adventures X wiki tracks units, traits, and Raids coverage.

Frequently Asked Questions

What is Undertale Adventures X Raid Act 3?

It is the third tier of the Raids mode in Undertale Adventures X, the Roblox tower defense game by Side Productions. You defend against scaled-up enemy waves and an act boss, then collect Tokens for clearing it.

Which unit is best for the boss in Undertale Adventures X Raid Act 3?

Mettaton NEO is the community's consensus top single-target damage dealer and boss killer. Pair him with a tank that holds the line long enough for his damage to land.

Do I need the +50% Tokens gamepass to farm Raid Act 3?

No. The gamepass increases Raids-mode Token yields by 50 percent, which speeds up progression, but Act 3 is clearable without it. The AFK Chamber covers passive gains for free.

How should I prepare if I keep failing Act 3?

Level your core five units first, then roll traits on your boss killer before anyone else. If you still lose, swap one slot at a time — usually adding a tank or a crowd-control unit — and note which wave breaks your defense.