Defense Io

Defense Io is a top-down tank survival game where every wave of enemies is a little stronger than the last.

Take control of a tank and defend your base against relentless waves of enemies. Kill them for resources, spend those on upgrades between fights, and hold on as the pressure keeps climbing.

Work through a deep upgrade tree of 20+ guns — from a single barrel to homing rockets, spinning blades, and a vortex cannon that catches enemy bullets. Choose from eight hull types — a berserker that hits harder the lower your HP drops, a shield that blocks fire from the front, a kamikaze built around ramming, and more.

It's not just your tank: place turrets, walls, and gates around your base, upgrade them mid-fight, and build drone hangars that gather resources or repair damage on their own.

Rare cores drop from tough enemies and bosses and carry over between runs forever. Spend them in a permanent meta-shop to unlock guns, hulls, and buildings for good.

How many waves can you survive?