High attack power for Zap Zombies - Android

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• High attack power

Not only should you upgrade your survivors themselves, but once you hit level 10, you'll unlock the gold mine, where you can earn gold. Gold allows you to buy upgrades that affect all of your survivors at once. The most important of these is Zombology, as it improves your characters' attack power permanently. Upgrade that as often as possible, and make it your first priority.

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