Upgrade survivors for Zap Zombies - Android

• Upgrade survivors

Upgrade both your survivor and the other four unlockable ones. All of the unlockable ones will earn essence for you by killing the zombies that are coming for you. You can even stop attacking and put the phone down at any time that you want to, because the survivors will kill the zombies endlessly. Even when they reach you, all they do is shake the barriers; they won't damage you or your team.

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