Into the Backrooms TD Units Tier List

S-Tier — Meta Defining

This wiki covers Into the Backrooms TD (Roblox Game ID 123446017566246) by the Backrooms Tower Defense group — not Backroom Tower Defense (10498602208), not [TRADE] Backrooms Tower Defense (17480843538), and not The House TD. Always verify you are in the correct experience before redeeming Codes or Trading.

S-tier units carry hard modes and leaderboard pushes. **Frowner** (Secret DPS) melts boss HP with burst cycles. **Mega Rare Tower** (Summon Exclusive) combines range and ability uptime unmatched in Class 4. **Async Human** (Legendary All-rounder) fits every map when upgraded.

These units justify Gem spending and Trade premiums. If you pull any S-tier from crates, prioritize upgrade materials over selling — even duplicate copies have Trade value on Game ID 123446017566246.

• S: Frowner, Mega Rare Tower, Async Human
• S-: Gaming Master, Entity 67, Warrior

A-Tier and B-Tier — Reliable Core

A-tier units anchor most successful clears: **Entity 67** (Heavy DPS), **Warrior** (Melee Burst), **Smiler** (Debuff), and **Bacteria** (DoT) excel on specific maps. **Gaming Master** (Craft Reward) jumps to S-tier in sustained fights when craft investment completes.

B-tier includes solid Epics and Rares: **Hound** (Fast DPS), **Skin Stealer** (Melee), **Partygoer** (AoE), and **Camerman** (Ranged DPS). These carry Class 1–2 before Legends and Secrets scale past them.

Build around one S-tier carry plus two A-tier support units. See Endgame Builds for six-unit templates using these rankings.

• A: Entity 67, Warrior, Smiler, Bacteria, Gaming Master
• B: Hound, Skin Stealer, Partygoer, Camerman

C-Tier and D-Tier — Early Game Only

C-tier units work in tutorial and Level 0 clears but fall off quickly: **Researcher** (Support) offers utility early, **Survivor** (Starter DPS) handles first waves cheaply. Do not invest heavy upgrade currency here past mid-game.

D-tier is not "unusable" — it means outclassed at current patch. Starter Commons belong here for Class 3+ content. Replace them as crate summons deliver B-tier or higher units.

Full roster details live on All Units. Compare trade values on Trading Tier List before selling C-tier duplicates — some still fetch modest Coin-equivalent demand.

• C: Researcher, Partygoer (unupgraded)
• D: Survivor (Class 3+), starter Commons

Upgrade Investment by Tier

S-tier units justify maximum upgrade investment — max Frowner or Entity 67 before spreading currency across B-tier backups. A level 3 S-tier carry clears Class 4 boss waves; three level 1 Legendaries do not. Follow upgrade priority in Endgame Build templates aligned with these tier placements.

B-tier units serve as budget substitutes until S-tier replacements arrive from crates or Trading. Max one B-tier carry for Class 2 farming, then stop investing when Epic debuff units enter your roster. Hound (35 trade value) trades easily when Entity 67 (150 value) replaces its DPS role.

C-tier and D-tier units should receive minimal upgrade spend beyond tutorial levels. Survivor handles Level 0 at cheap upgrade costs, then gets replaced — not upgraded to Class 3. Researcher support utility drops off once Smiler debuff arrives from crate summoning.

Tier List Limitations

Map layout overrides tier placement. Partygoer ranks B-tier for general content but jumps to A-tier equivalent on Level Fun swarm maps with clustered Entity spawns. Async Human S-tier all-rounder flexibility matters most on split-path maps where single-role units underperform regardless of raw tier rank.

Co-op splits tier value between players. One player's A-tier Smiler debuff enables another player's S-tier Frowner burst — individual tier ranks understate team synergy documented in Co-op Build guides. Plan dual loadouts in Team Builder rather than copying solo tier lists blindly.

New units from events may launch unranked or provisional before community testing settles placement. Wait 48–72 hours after event banner launches before treating day-one tier placement as stable on Game ID 123446017566246.