Earn more gold for Zap Zombies - Android

• Earn more gold

Upgrade the mine to earn more gold from it. You can go to the mine whenever you want and tap that instead of tapping zombies, and each tap will earn you gold. The best way to earn a ton of gold though (since it doesn't earn gold when you are offline) is to leave your phone open, make sure your screen is set not to go to sleep or idle, then go spend all of that gold you rack up.

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