Hints
Energy
If you space out your interatctions during the day and wait for energy to recharge it is possible to progress through the game quickly without spending any money.
Optimize
Always let the game optimize your deck if you don't know how to do it yourself so you are in the best shape possible.
Friends
Make a point of choosing your friends wisely so you don't have freeloaders. Just keep space for friends who will support you.
We have more cheats and tips for this game here, Zombie Farm Battles cheats
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