
Alien Defense: Space Tower RTS
Sci-Fi Base War Strategy Games
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Free
With Ads
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About
Alien swarms are closing in. Build your base, raise an army and hold the line in real-time sci-fi strategy.
BUILD AND DEFEND
- Construct and upgrade buildings to train troops and protect your command center.
- Mine crystals, train your forces and push back wave after wave of alien invaders across a growing campaign.
PICK YOUR BUILD EVERY WAVE
- Pick new buildings and army upgrades as the battle unfolds.
- Chase powerful upgrades to shape a different strategy every run.
COMMAND A SCI-FI ARMY
- Unlock infantry, armored vehicles, mechs and air units, each with its own role on the battlefield.
- Turn the tide with battlefield skills: repair your base or call in a nuclear strike.
GROW STRONGER
- Upgrade every building and level up your units between battles.
- Research a tech tree to boost damage, health, mining and critical hits.
- Open supply chests for blueprints and unit shards.
CLIMB THE ARENA RANKS
- Take your army into the Arena, battle rival commanders and earn new ranks.
PLAY ANYWHERE
- Play offline, no Wi-Fi needed.
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What's New in Alien Defense
1.2.3
September 28, 2026
Welcome to Alien Defense! The game is now a real-time sci-fi strategy defense. - New features unlock step by step as you progress, and your first stages cost no energy. - Smoother unit animations and faster battle loading.
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