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The zombies ate your brains!
This subject currently has no proper strategy associated with it. If you have figured out a good strategy, please add it or the zombies will eat your brains!
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They can be tough nuts to crack.
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It's Not a Door... it's a Portal! is an achievement in Plants vs. Zombies: Garden Warfare 2 that was added in the Trials of Gnomus DLC. To earn it, the player must enter the Mystery Portal inside the Town Hall and complete three matches inside it.

It's Not a Door... it's a Portal! icon in the Xbox One version

Achievements in Plants vs. Zombies: Garden Warfare 2
Added in updates
Trials of Gnomus It's Not a Door... it's a Portal! · The Secret of Secrets · This is Craaazy! · Somewhere Over the Rainbow · Alright Meow · Open the Door Get on the Floor · Boss Battle · Boss Battle Specialist · Boss Battle Boss · More Secrets? · Team Player · Together we Win
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