- Undertale Adventures tier list ranks units by stage performance, not rarity alone
- Sans and Undyne lead S-Tier for high-difficulty and sustained damage roles
- Papyrus and Frisk carry early progression before a specialized roster forms
- Toriel provides defensive support that stabilizes teams under sustained pressure
- Placement and upgrades often matter more than chasing a single premium unit
How This Undertale Adventures Tier List Works
A useful ranking in Undertale Adventures X depends on the content you are actually playing. Early-game units are judged by cost efficiency and reliability, while late-game units are valued for scaling, crowd control, boss damage, and the ability to support a complete team. This tier list separates recommendations into early progression, general content, and high-difficulty stages so you never rely on a single ranking without context.
The tiers below reflect the current version of the game as played on the official Undertale Adventures X Roblox page. Balance patches and new unit releases can shift these ratings, so always re-check after an update before investing heavily in upgrades or trait rerolls.
Every balance adjustment can move a unit up or down. Before spending saved summoning currency or reroll resources, review the latest patch notes on the official Undertale Adventures YouTube channel and compare the changed unit against your current roster.
Full Tier Rankings
Here is the complete tier breakdown, organized by the content each unit performs best in. Use this table as your starting point when deciding which units to upgrade, reroll traits on, or place in your active team.
| Tier | Unit | Role | Best For | Key Strength |
|---|---|---|---|---|
| S | Sans | Damage and control | Late-game stages, boss encounters | High impact when enemies survive multiple attack cycles |
| S | Undyne | Sustained damage | General progression, dense waves | Consistent output across repeated waves |
| A | Papyrus | Early/mid damage | Beginner progression, normal stages | Dependable coverage before premium units arrive |
| A | Toriel | Defensive support | Sustained-wave pressure stages | Team stability and survivability |
| B | Frisk | Starter utility | Opening stages, early farming | Easy learning curve for placement timing |
| B | Flowey | Flexible filler | Roster building, formation testing | Practical value while roster is incomplete |
For a side-by-side comparison of the top three picks, the card grid below summarizes the practical trade-offs you should weigh when building a team.
Sans - S Tier
- High-impact damage and control
- Best when enemies stay on route long enough for repeated attacks
- Rewards careful placement and upgrade investment
- Do not weaken your whole team just to obtain one
Undyne - S Tier
- Reliable sustained damage
- Consistent contribution wave after wave
- Strong lane coverage on long route sections
- Works well beside support and control units
Papyrus - A Tier
- Practical early and mid-game damage
- Carries progression before stronger units arrive
- Fits balanced teams with limited options
- Keep upgraded while building a specialized roster
Rarity and appearance do not decide a tier placement. A well-positioned, well-upgraded A-tier unit often outperforms a poorly placed premium one. Base your upgrade decisions on actual stage performance, not unit rarity alone.
Best Units by Content Type
Different modes reward different units. This table matches each tier-list pick to the game mode where it delivers the most value, so you can allocate stamina, upgrade materials, and trait rerolls efficiently.
| Content Type | Recommended Units | Team Approach |
|---|---|---|
| Story and progression stages | Papyrus, Frisk, Undyne | Balanced team with reliable damage and coverage |
| Resource farming stages | Undyne, Papyrus | Prioritize consistent clear speed and survivability |
| Challenge and high-difficulty content | Sans, Undyne, Toriel | Build around stage threats; use best-traited units |
| Sustained-wave pressure | Toriel, Undyne | Protect upgraded carries with defensive support |
| Limited-time events | Event-dependent | Check event rules first; match units to objectives |
Toriel deserves special mention for difficult content. She contributes most when the team needs stability rather than another pure damage dealer. Pair her near your main damage group so her support range covers Undyne or Sans, protecting the units you have invested the most upgrades into.
Limited-time units and event rewards should be compared against your existing roster at a similar investment level. A new event unit is only worth chasing if it fills a role gap your current team cannot cover.
Step-by-Step: Building a Tier-One Team
Follow this progression path to move from a starter roster to a high-difficulty team without wasting resources along the way.
Clear Opening Stages with Starter Units
Use Frisk and Papyrus to learn placement timing and the basic tower-defense loop. Concentrate upgrades on one well-positioned unit instead of spreading currency across the whole map. Replace or supplement these units as stronger options become available.
Establish Reliable Core Damage
Add Undyne to your active team and place her near a long route section to maximize attack opportunities. Combine with Papyrus or Frisk for additional early coverage while your roster develops.
Add Defensive Support
Introduce Toriel once your main damage formation needs protection. She stabilizes teams during difficult sustained waves and pairs well with one or two main carries.
Invest in High-Impact Units
Upgrade Sans for late-game stages and boss-focused encounters. His value grows when enemies survive multiple attack cycles, so invest carefully and support him with units that improve uptime.
Optimize Traits and Reinvest Rewards
Reroll traits on core damage dealers first, then essential supports. Replay completed stages for additional currency, and test new units in normal content before taking them into difficult stages.
When your team clears normal content consistently and you have a stable reserve of summoning currency, you have reached the point where saving for high-impact targets beats routine summoning.
Team-Building Checklist
Before committing resources to any unit on this tier list, run through this checklist to confirm the investment fits your long-term plan.
Before Investing in a Unit:
- Confirm the unit fills a role my team is missing
- Compare upgrade cost against similar owned units
- Test the unit in normal stages before difficult content
- Check the latest patch notes for balance changes
- Reserve reroll resources for permanent carries only
A common mistake is spending reroll resources on temporary units that will soon be replaced. Prioritize your strongest long-term units first, and evaluate every duplicate unit before discarding it, since duplicates may be required for enhancement or other progression systems.
Chasing a single S-tier unit at the cost of weakening the rest of your team usually produces worse results than a balanced, fully upgraded roster. Prioritize premium units when available, but keep the team functional around them.
Tier List FAQ
Q: Who is the best unit in the Undertale Adventures tier list?
Sans ranks highest for high-difficulty content thanks to his high-impact damage and control, but his value depends on careful placement and upgrade investment. Undyne is the most reliable all-around pick because she contributes consistently across repeated waves in general progression.
Q: Are B-tier units like Frisk worth upgrading?
Yes, early in progression. Frisk helps new players learn placement and upgrade timing while clearing opening stages and early farming maps. Move B-tier units into secondary roles once stronger options perform better at a similar investment level.
Q: Does this tier list apply to every game mode?
No. This Undertale Adventures tier list separates recommendations by content type: early progression, general stages, resource farming, and high-difficulty challenges. Limited-time events may require different units based on their specific objectives, so check event rules before using your standard farming team.
Q: How often do tier rankings change?
Rankings shift whenever the developers release balance adjustments, new units, or summon changes. Review update announcements on the official channels before spending saved resources, and reassess any previously recommended unit after a patch changes its practical value.