12 towers, 6 damage types: the complete matrix guide
Every tower matched against every armor class, every damage type against every faction — the reference matrix our coaches use, condensed for the field.
FILED UNDER Tower Science
OTTTD's depth hides in one table: twelve tower types firing six damage types at enemies with armor classes that gate what's allowed to hurt them. Learn the matrix and the campaign turns from reaction into planning.
The six damage types
Kinetic is the baseline — cheap, reliable, stopped dead by armor. Incendiary adds burn-over-time that chews unarmored swarms and keeps ticking through adds phases. Cryo doesn't kill, it loans you time — slowing stacks that multiply every other tower's effective range. Energy ignores most conventional armor and is the faction-agnostic premium option. Explosive brings AoE for clustered waves and structure damage for boss phases. Toxic is the specialist — stacking damage-over-time that shreds the organic enemies dominating Nightmare's roster.
Tower archetypes by role
The twelve types cluster into four roles. Point defense (gun emplacements, railguns) kills single targets at range. Area control (mortars, explosive batteries) owns clusters. Support (frost projectors, slow fields, buff rigs) multiplies everything else — never more than two per grid, never fewer than one. Anti-air (missile batteries, energy spires) covers the dimension's flying units; skipping them is how Eyeball Avenue and the shark fight end runs. Build roles, not towers — a grid missing a role fails the wave designed to punish that gap.
Sell-and-rebuild is the hidden seventh damage type — repositioning mid-wave to match the incoming armor class is worth more than any single tower's upgrade tier.
Faction matchups
Steamcrust's mechanical crustaceans carry armor that gates kinetic and demands energy or explosive answers — build accordingly or watch bullets spark off shells. Nightmare's Horror faction runs the opposite math: organic targets that resist conventional damage but melt under toxic stacking and incendiary pressure. Robot units in both dimensions carry their own resistance profile — the update notes famously had to rebalance them after players found the trivial counter. Mixed-faction missions like The Overmind Rift demand hybrid grids; that's the campaign's final exam.
There are no bad towers in OTTTD — only towers fighting enemies they were never built for.
ARENA TOWER SCIENCE DESKKey takeaways
Short on time? This is the manual condensed to a sticky note for your monitor.
- Six damage types: kinetic, incendiary, cryo, energy, explosive, toxic
- Build roles — point defense, area control, support, anti-air
- Steamcrust armor gates kinetic; bring energy and explosive
- Nightmare's organics melt under toxic and incendiary stacks
- Mid-wave repositioning beats upgrade tier — the grid is fluid
Asked after this manual
The questions commanders send the desk after reading this guide.
Want the whole armory?
The Elite Commander Pack ships weapon rolls tuned to the matrix — gear that answers the armor class you're about to face.