Mecha Fortress is a free idle tower defense for iPhone and Android. Your mech holds the bottom of the lane, and between waves you draft its turrets three cards at a time.
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You don't place towers on a map. The mech sits at the bottom of one lane and never moves. What it fights with is decided between waves, three cards at a time, so every run builds a different machine.
Robot enemies come down one lane toward your mech, wave after wave. Bosses keep no schedule, change the rules of the fight and can arrive while you're still building.
Between waves you draft new tech: a turret for an empty mount, a damage boost that costs fire rate, an elite card that rewrites a weapon. Spend a die to reroll the offer.
Surviving is only the start. The cleaner you hold the line, the more stars you earn, and stars pay out in chests.
Wave 4 · between waves
Interactive illustration, not the live game
Main gunPick one card
Dice are limited. Spend one when the offer doesn't fit your build.
Straight from the game on iPhone. Swipe through, or watch 42 seconds of gameplay.
Gameplay trailer · 0:42
The mech holds the bottom of the lane while robot waves push down from the top. Cards drop in between waves, turrets bolt onto empty mounts, and bosses crash the party whenever they like.
If you like tower defense, roguelike deckbuilders, idle games, sci-fi survival or dieselpunk mechs, Mecha Fortress sits where those overlap.
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Turrets you draft mid-battle, a main gun for the mech itself (the Heavy Cannon, the Pyroblast, the Voidpiercer and others), and damage in elements like Fire, Electric, Toxic and Void. Here is a first look. The rest of the arsenal unlocks as you push on.
Rapid fire
Explodes and sets targets burning
Slows enemies
Arcs chain between enemies
Area lightning, paralyze
Classified until you unlock it
A campaign that keeps opening new fronts the further you push, plus modes that keep going after it.
Opens as you push on
One boss, one day to break it. Everyone who fights it lands on the same leaderboard, ranked by shield layers torn off. The modifiers change at midnight, and so does the answer. After each attempt you keep a Deploy Card for the next run, and they stack.
For when the campaign stops scaring you. Tougher fights for pilots who want them.
A descent with its own rules. Keep your nerve floor after floor to bank a win, because one bad floor costs you.
Limited events with their own boards and reward tracks.
Pays out for every enemy type you learn to kill.
Your base keeps working while the game is closed. Mines and generators fill up offline, and patrols bring in resources while you're away. Auto battle and auto advance run the fight for you when you'd rather watch than tap.
Short answers about Mecha Fortress. Something missing? Ask support.
Mecha Fortress is a free mobile tower defense game where your tower is a war mech. It sits at the bottom of a single lane and never moves, and between waves you draft its turrets and upgrades from three cards at a time. It's an idle tower defense with a roguelike draft, made by NOXGAMES for Android and iOS.
Yes. The full tower defense campaign is free on Google Play and the App Store. The game has optional in-app purchases and ads.
Yes. It's on Google Play for Android phones and tablets, and on the App Store for iPhone and iPad running iOS or iPadOS 15 or later.
You don't place towers on a map. Your mech is the tower, and its turrets arrive as cards you draft mid-battle, so every run builds a different machine. Element matchups and draft order matter more than placement.
Your base keeps producing while the game is closed: mines, generators and patrols gather resources offline, and it's waiting when you come back. Auto battle and auto advance can also run fights for you.
Draft order, element matchups and upgrade priority decide whether you survive. Enemies resist damage elements differently, so a build that works in one fight can stall in the next.
The Devourer is the daily boss challenge. Everyone fights the same boss for one day and lands on a shared leaderboard ranked by how many shield layers they tore off. Modifiers change at midnight. After each attempt you keep a Deploy Card that carries into your next run.
Draftable turrets include the Autogun, Rocket, Acid Spitter, Tesla Coil and Stormcaller, and more of the arsenal unlocks as you push on. The mech's own main gun, such as the Heavy Cannon or the Pyroblast, is picked separately.
No. The campaign starts in the Wastelands and keeps opening new fronts as you push on. Hard mode, the Insect Hive, seasonal events and the daily Devourer keep going after that.
Google Play rates it Everyone. The App Store rates it 9+.
A stage fits in a coffee break. With auto battle on, the game can play stages for you.
Mecha Fortress is developed and published by NOXGAMES s.r.o., an independent mobile game studio. It launched on the App Store on October 2, 2025.
Use the support form on mechafortress.com/support or email support@noxgames.com. Include your player ID if you have it, so the team can find your account faster.
Free on iPhone, iPad and Android. Rated 4.9 on the App Store and 4.4 on Google Play.