Birds vs Zombies Cheats
Required App: GMD Speed Time APP
You can get 500 coins when the Gift's Time expires at 0.
After you get your 500 coins for free, the timer will add 30 seconds from the previous time.
Therefore it will eventually more time to wait when you get more 500 coins.
You can eliminate the timer when using GMD Speed Time APP. This will speed your android's time depending how fast is your GMD multiplier is set.
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