25 Billion Tournament

About
The 25 Billion Tournament is an Angry Birds Friends! tournament that happened on:​​​​​​​ It's a tournament made to commemorate the 25 Billion likes on Angry Birds's Official Facebook Page, it features several 25 Billion related structures.
 * Tournament 1 (September 30th to October 7th 2013)

New Features

 * Blue Birdday Hat: A pig's wear.
 * 25 Billion Hat: Another pig's wear.