On December 10th, Angry Birds celebrated their fourth birthday, and added 15 new levels to the original app, under the Bird-day Party Episode.
There have also been additions to the Short Fuse episode from the previous update and you can now play 30 levels in a piggy laboratory with scientists and potions. There’s even a new ability and new potions.
The Shock Wave Power for Bomb creates a circle of electricity and unleashes an almighty blast for the booming birdy.
Meanwhile, new potions make the piggies look, well, a little bit different.
The update is available now and completely free of charge..