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What is the hidden angry birds achievement on game center?

09-15-2013, 10:44 PM
#1
Joined: Sep 2013
Posts: 1
What is the hidden angry birds achievement on game center?

What is the hidden angry birds achievement on game center?
09-15-2013, 11:39 PM
#2
Joined: Apr 2012
Posts: 3,605
Do they have hidden achievements?

Pine Entertainment