If you’ve been grinding through Mech Assemble: Zombie Swarm, you already know the game isn’t just about dodging bullets and mowing down endless zombies. It’s also about choosing the right mech—because while some units will carry you through the apocalypse like unstoppable war machines, others fall flat the moment the horde gets serious.
This tier list breaks down every mech into S, A, B, C, and D tiers, helping you decide which ones are worth your time, upgrades, and resources.
Mech Assemble Zombie Swarm Mech Tier List (August 2025)
D-Tier
These mechs fall off hard as the game progresses. They might look cool at first, but don’t expect them to carry you past the early stages.
- Awakening – The starter mech. Fine for your first few runs, but once the game ramps up, its low scaling makes attacks feel like you’re gently poking zombies instead of fighting them.
- Doomsday Tank – Despite the intimidating name, it’s fragile and underpowered. With low health and damage that can’t keep up, it’s more of a liability than a defender.
C-Tier
C-tier mechs can work in the short term but require heavy upgrades to feel impactful. They’re inconsistent and often leave you wishing you had picked something stronger.
Rally Wrecker – Decent for clearing swarms thanks to its crowd control, but extremely fragile. Think of it as a temporary distraction mech.
Frost Scorpion – Gains passive HP boosts, but damage is very underwhelming. Needs a ton of drill upgrades to feel useful, making it a grind-heavy option.
B-Tier
These mechs can become reliable, but only after you’ve put in resources. Out of the box, they aren’t game-changers, but with upgrades they start to shine.
War Machine – The crit specialist. Gains +25% crit rate and electromagnetic coil chance, with a rapid fire rate. Strong damage dealer, but very squishy.
Thunderbeast – Launches orbiting thunder missiles for consistent AoE damage and comes with tanky armor. Strong mid-late game pick, though rare to obtain.
Thunderhorn Guard – Great at AoE destruction with periodic electromagnetic bursts. Locked behind the battle pass, but worth it if you can get it.
A-Tier
These mechs don’t quite hit S-tier dominance, but they’re versatile and strong across most situations.
Fire Dragon – Brings massive AoE fire damage and doubles its fire attack. Perfect for clearing hordes.
Flame Feather Archer – A fast, high-damage glass cannon. Expensive to upgrade and fragile, but devastating if built properly.
Pirate Gunner – Unique with its anchor ability, which can generate whirlpools for crowd control. Good mix of offense and defense with solid durability.
Thunderous Judgment – Gains stacking bonuses, including extra attacks and thunder spears. Not the heaviest hitter, but extremely fun and effective when procs chain together.
S-Tier
These mechs dominate every mode. If you’re lucky enough to get them, they’ll carry you from early to late game without breaking a sweat.
Crimson Phantom – Summons demon bots with every kill (20% chance) and dishes out explosive AoE. Absolute chaos on the battlefield.
Shadow Warrior – Wide-range shuriken attacks with bonus spike triggers. Perfect wave clearer, turning zombie hordes into mulch.
Future Warrior – Every 60 seconds, unleashes a giant laser beam that cuts through bosses and waves alike. Incredibly satisfying and deadly.
Goddess of War – Combines bonus attack with a lightning shield that turns bullets into thunder bursts. Great synergy and flashy effectiveness.
Fire Judgment – Pure AoE destruction. Every attack has a chance to fire six judgment cannons. Ideal for players who love overwhelming damage output.
When it comes to Mech Assemble: Zombie Swarm, the S-tier mechs are your long-term investments—they can carry you through every stage of the game. A-tier mechs are reliable workhorses with strong abilities, while B-tier mechs reward you if you’re willing to invest in upgrades. C and D-tier mechs, on the other hand, are best left behind once you unlock stronger options.