The shields will now be up against the undead because Zombie Defense Agency is all about building towers to stop those walking, rotting flesh. You know the drill: build some towers to prevent the enemy from getting into the other side. The playing field is a bit wide now though so what you have to do is to make a route that will make the zombies walk the farthest. You can't completely block the opening though, and there has to be at least one empty space for the zombies to pass through, but if you did it right you won't have to seal the zombies at the entrance.
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