Gear Defense: Merge Zombie TD

CTT Production

In-app purchases

About this game

Place gears. Connect weapons. Crush zombies.

Gear Defense is a merge tower defense game where gears power your weapons. Drop gears onto the grid, connect them to activate turrets, and merge matching gears to evolve your arsenal into devastating firepower. Miniguns, flamethrowers, rocket launchers, snipers, shockwave blasters — all driven by spinning gears.

⚙️ GEAR-POWERED WEAPONS
No ordinary tower defense. Your turrets only activate when gears connect. Build chains, optimize your grid layout, and rearrange between waves to maximize damage output. Every placement decision matters.

🧟 SURVIVE ENDLESS ZOMBIE WAVES
Zombie hordes, mutant rushes, and boss attacks hit harder every round. Adapt your merge defense strategy between waves or get overwhelmed. Earn coins, collect loot, spend on upgrades that keep your survival going.

🔫 BULLET HELL COMBAT
Watch bullets, flames, and rockets fill the screen. Deep survival means increasingly intense bullet hell chaos — satisfying, screen-filling action that escalates as you push further.

🛡️ RPG UPGRADES & LOOT PROGRESSION
Unlock warrior skills, collect gear loot, and power up weapons between rounds. RPG-style progression that rewards long play sessions and strategic thinking.

🔌 OFFLINE TD — PLAY ANYWHERE
Full offline tower defense, no WiFi needed. Complete strategy gameplay without an internet connection.

WHY THIS MERGE TD STANDS OUT:
— Gear-chain mechanic: the only merge TD where gears physically power your weapons
— Active strategy: rearrange your entire grid defense between every wave
— Endless zombie survival with escalating boss fights
— Bullet hell shooting action meets merge puzzle depth
— Offline strategy game — play without WiFi anywhere
— RPG upgrades, loot drops, and skill unlocks

Place gears. Merge weapons. Survive the zombie horde. Download now.

Ratings and reviews

the game is fun but once you start getting to the point where you're getting the higher multipliers like +8 and + 16 the game just starts chugging to the point of almost being unplayable, even if you try to do the bare minimum with 1 weapon with a decently high multiplier it'll eventually load in so many bullets that nothing starts moving, the tube will just stop taking in stuff, it'll just pile up, and since you're not attacking you'll just be forced to lose. it's fun but very poorly optimized.

this game is really fun and there are no ads which is awesome. that being said it's not a finished game. any time you get a three star weapon it drops to about 1 frame a minute. also there's only 10 or so levels right now. the 11th was a blue screen for me with mobs marching across it. and the 12th level didn't work at all. if this game gets updated it would be a 5 star so hopefully it gets an update soon

update 2: map 25, wave 4. everything is mirrored. unplayable and many other bugs. for example multiplier cannot go above 16. some times items are not place able. will increase to 5 star if bugs fixed. very fun and addictive game. but faced a problem. on map 5 I put so many gears and it spawned so many weapons that game crashed 😳 😁 fix this. and its gonna be a hit game... Update: not yet fixed after update