There is no official Retro Tower Defense tier list. Any useful ranking is a dated comparison of specific tower versions under the same conditions, not a permanent order copied from rarity colors. The official experience can change tower balance, banners, events, and maps without preserving an external list, so this page explains the ranking standard and labels community leads separately from tested conclusions.
What each tier means
S tier should be reserved for a tower that is exceptional in a defined job and remains efficient in several relevant maps or modes. A tier is consistently strong with manageable costs or restrictions. B tier is a sound specialist or progression option. C tier needs a narrow setup, higher investment, or replacement plan. Unrated means the current version or source has not been tested well enough.
These grades are not a trade value scale. A limited skin or scarce tower can be expensive to collect while performing only an ordinary combat job. Likewise, an accessible starter may rank highly for new-account progression even if an expensive late-game unit eventually exceeds it.
Score six separate jobs
Test opening stability, group clearing, durable-target pressure, support value, cash efficiency, and availability separately. A single total DPS figure misses range coverage, target count, attack downtime, upgrade timing, ability control, and placement limits.
Use the same map, difficulty, modifiers, party size, and wave pacing for comparisons. Spend the same approximate round cash on both candidates. Record the earliest point at which each becomes useful and the point where it stops meeting the lane’s requirement. Maximum upgrades alone favor towers that a real run may never afford in time.
Community shortlist versus verified result
Community discussions frequently highlight names such as Mage, Noli, Mech, Forest Mage, Doombringer, and Helper Bot. Those names are Community reported leads, not an official ranking and not an assertion that each is currently obtainable. Use them to decide what to inspect in your own collection, then verify the exact tier, trait, upgrade state, and patch.
If a community ranking does not state its test date or mode, place it in the research queue rather than the table. A tower praised for Endless scaling may be slow in Casual. A unit valued for a Forsaken event badge route may not represent ordinary progression.
A repeatable test card
Run at least three comparable attempts. On each run, note the first placement wave, upgrades purchased, leaks, boss time, unused cash, and support dependencies. Change only the tower under test when possible. If a run uses a modifier or another player’s buff, record it.
Then assign a role grade rather than forcing one global number:
- Early: survival before the economy is established.
- Clear: reliability against clustered or repeated enemies.
- Boss: focused pressure during durable-target windows.
- Support: measurable benefit delivered to useful placements.
- Economy: net benefit and the wave when it repays its cost.
- Access: current source, probability, price, or progression gate.
Ranking for different accounts
A beginner list should prefer accessible towers that form a functional loadout. Community documentation reports Doombringer, Bloxxer, Sniper, and Paintballer as starter grants; confirm the current grant before ranking them. See Best Starter Towers for the early-account process.
An established account can maintain separate lists for Hard, Endless, solo play, and coordinated groups. Do not average these into a misleading universal tier. If two towers are close, describe the condition that changes the choice instead of pretending the order is exact.
When to move a tower
Move a tower only after reproducible evidence: changed live card text, a new upgrade cost, a patched ability, multiple comparable runs, or a newly closed acquisition route. Keep the previous dated note so readers can distinguish a balance change from a testing correction.
Do not move a unit because one run failed on a different map. Placement geometry and lane length can reverse a comparison. Retest on at least one neutral map and one map that exposes the suspected weakness.
Read the current ranking safely
This page intentionally does not invent exact S-to-C placements without a complete controlled dataset. Use the Tower List to build a current roster, record results with the six-job card above, and treat unsourced image rankings as opinions. The strongest answer is often conditional: best affordable opener, best owned boss option, or best support for the specific placements you can make.
Confidence: method and official game scope are high confidence. Named community candidates are Community reported. Current stats, tiers, and availability require in-game testing dated to the active update.