Backpack Defense: Zombie TD

Backpack Defense: Zombie TD turns your backpack into the battlefield. In this free tower defense game for Android, you hold a shrinking line against wave after wave of zombies — and your only arsenal is the gear you can fit, arrange, and merge inside a grid backpack.

Every run starts with an empty pack and a horde on the horizon. Weapons come in different shapes and sizes, so where you place them matters as much as what you carry. Drag, rotate, and rearrange your loadout to squeeze the most firepower out of every square, then merge matching weapons to forge stronger ones. Push a weapon to level 3 and choose between two branching upgrade paths, shaping a build that fits how you like to fight.

Each weapon you deploy on the defense line summons an Eidolon — a guardian spirit with its own role and attack style — so your backpack layout directly decides who stands between you and the zombies. As you defeat the horde you earn experience, level up mid-run, and draft roguelike Battle Cards that stack new powers and synergies onto your build. No two runs play the same.

The waves keep coming, faster and tougher, and the siege only ends when your line breaks — or when you outlast it. That mix of inventory puzzle, merge upgrades, and tower defense strategy is what makes Backpack Defense: Zombie TD so hard to put down: every run is a fresh packing puzzle, a fresh build, and a fresh last stand.

Download Backpack Defense: Zombie TD free for Android and see how long your backpack can hold the line.