Gear Defense: Gear Merge TD

CTT Production

In-app purchases

About this game

Place gears. Merge 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 gear chains, optimize your grid layout, and rearrange between waves to maximize damage output. Every gear placement matters.

🧟 SURVIVE ENDLESS ZOMBIE WAVES
Zombie hordes, mutant rushes, and boss attacks hit harder every round. Merge your gears fast enough or get overrun.

🔫 EPIC MERGE WEAPONS
Miniguns, flamethrowers, rocket launchers, snipers, shockwave blasters, and more. Merge gears, upgrade weapons, and unleash bullet hell against the horde.

🛡 KEY FEATURES
- Gear-powered merge tower defense — build and merge gear chains
- Endless zombie survival waves with bosses
- Free offline play — no WiFi needed
- Warrior upgrades, loot bags, RPG skills
- Bullet hell action with satisfying weapon effects

Gear Defense is all about gears, merging, and survival. Merge weapons, defend your base, and prove your gear machine can outlast the horde.

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

2.5 if I could. the game is actually fun, but mine doesn't give me an option to upgrade to ad free, two of the panels are permanently locked (even though I'm level 109 and maxed the upgrade tree) and so many of the new weapons don't seem to have any way to unlock