- Undertale Adventures X best units tier list ranks units by damage, range, support value, and acquisition difficulty.
- S Tier units excel at difficult stages, long runs, and organized team play.
- A Tier units form a reliable core for general progression and solo play.
- Evaluate by situation: early progression, late-game scaling, and team modes favor different units.
- Acquisition difficulty matters: a hard-to-get unit is not automatically the best choice.
How This Tier List Is Built
A useful tier list should reflect the situation in which a unit is used, not a single flat ranking. In Undertale Adventures X, a Roblox tower defense game by Side Productions, unit value changes depending on your progression stage, the mode you are playing, and whether you are solo or in a team. Our rankings weigh five core criteria:
| Criterion | What It Measures | Weight |
|---|---|---|
| Damage output | Sustained DPS and burst value against waves and bosses | High |
| Range and coverage | How long a unit can attack enemies along the path | High |
| Support value | Buffs, debuffs, control, and utility for the team | Medium |
| Acquisition difficulty | Cost, rarity, and time needed to obtain the unit | Medium |
| Mode performance | Results in Story, Raids, Gauntlet, and farming runs | High |
A B Tier unit with the right attack pattern can outperform an S Tier unit on a specific map. Use this tier list as a starting framework, then test placements against the actual enemy layouts in Ruins, Snowdin, Waterfall, Hotland, and Core.
S to D Tier Rankings
These tiers group units by role profile rather than naming individual stats, since unit performance shifts with each balance update. Check the official game page and community channels for the latest changes before committing resources.
| Tier | Category | Best For | Key Evaluation |
|---|---|---|---|
| S Tier | Late-Game Priority | Difficult stages, long runs, organized teams | High sustained output, strong range or coverage, scales well with upgrades |
| A Tier | Reliable Core | General progression, solo play, mixed difficulty | Good performance for the investment, useful across several stage types |
| B Tier | Situational Value | Specific enemy layouts, alternative builds | Stage-dependent performance, needs the right placement or team composition |
| C Tier | Early or Specialized Use | Starter rosters, low-difficulty stages | Limited scaling, narrower application, often replaced later |
| D Tier | Minimal Investment | Collection goals, experimental builds | Low impact in most content, not worth heavy upgrade spending |
Do not pour all of your resources into a single unit before your team can consistently clear stages. Spread early upgrades across dependable damage sources first, then specialize once your income is stable.
Unit Roles Compared
Each role fills a different need in your team. Match the role to the mode you are playing before deciding which units to upgrade.
Damage Units
- Primary enemy damage
- Direct attacks or area coverage
- Core placement for stage pressure
- Upgrade first for consistent clears
Area-Coverage Units
- Multi-target patterns
- Splash, piercing, and wide arcs
- Best against dense enemy waves
- Strong in Gauntlet and event runs
Support and Utility
- Buffs, debuffs, control
- Improves the whole team's output
- Stronger in coordinated team play
- Scales with effect uptime and range
| Role | Best Mode Fit | Upgrade Priority | Team Value |
|---|---|---|---|
| Damage | Story, Raids, Boss fights | ★★★★★ | Excellent |
| Area coverage | Gauntlet, wave events | ★★★★☆ | Excellent in groups |
| Support and utility | Team play, difficult stages | ★★★☆☆ | Situational but high |
| Economy | Early stage income, farming | ★★★☆☆ | Early-game focused |
| Starter units | First clears, low difficulty | ★★☆☆☆ | Replaced quickly |
Build teams with at least one dependable damage unit, a support or control option, and an economy plan for early upgrades. This balance clears far more content than stacking a single unit type.
Solo vs Team Tier Adjustments
Solo teams and cooperative runs reward different units. When you play alone, prioritize self-sufficient damage and wide coverage. In team compositions, specialized units gain value because teammates can cover their weaknesses.
| Factor | Solo Play | Team Play |
|---|---|---|
| Damage profile | Balanced, independent units | Specialized burst or boss units |
| Support value | Lower priority unless self-buffing | Very high, fills missing roles |
| Coverage needs | Must cover the whole path alone | Can split coverage with teammates |
| Economy units | Useful for early upgrades | Optional if teammates carry income |
| Acquisition bias | Favor accessible, reliable units | Rarer specialized units pay off more |
Assess Your Roster Gaps
Check whether your team is missing reliable damage, support, or coverage before summoning or upgrading. Summon with a clear role in mind.
Secure Core Progression Units
Use early resources on units that help clear main stages. Favor immediate account value over duplicates that do not change your progression.
Assign Roles for the Mode
Pick units that fit the current mode: wave clear for events, boss damage for Raids, fast reliable teams for farming runs.
Reassess After Each Update
Balance changes can shift the tier list. Recheck your damage, support, and farming teams after every major version change.
Traits should match the unit's job. Give damage-oriented traits to your carries, support traits to buffers and control units, and economy traits to income units. Do not waste rerolls chasing rarity when the trait does not fit the role.
Team-Building Checklist
Work through these milestones as you build toward a top-tier team. Each goal keeps your resources focused on units that stay useful across multiple modes.
Best Team Milestones:
- Build one balanced team with damage, support, and economy roles
- Upgrade active damage dealers before low-impact units
- Clear all five regions: Ruins, Snowdin, Waterfall, Hotland, and Core
- Assign role-appropriate traits before spending reroll resources
- Reassess the roster after every balance update or new unit release
For resource runs, use the fastest reliable team instead of the highest theoretical damage setup. Include an economy unit when the stage benefits from early income.
FAQ
Q: What makes a unit S Tier in the Undertale Adventures X best units tier list?
S Tier units combine high sustained output, useful attack range or coverage, and strong scaling after repeated upgrades. They perform well in difficult stages, longer runs, and organized team play, which is why they are late-game priorities.
Q: Should I only summon for S Tier units?
No. Acquisition difficulty is part of the ranking. A Tier units often deliver better value for the investment and can carry general progression and solo play. Fill roster gaps with a clear role in mind instead of chasing rarity alone.
Q: Do tier rankings change between solo and team play?
Yes. Solo teams should prioritize self-sufficient damage and coverage, while team compositions can assign specialized damage, support, and utility roles. A situational B Tier unit may become a top pick when it fills a missing role.
Q: How often does this tier list change?
Rankings shift with balance updates, new units, and trait adjustments. Review your main damage, support, and farming teams after each major version change, and check official announcements before spending upgrade or reroll resources.