Trick or Treat, originally called Angry Birds Halloween, is the first holiday-themed version of Angry Birds and Halloween-themed episode. It was released on October 21, 2010. It is based on the holiday of Halloween, and as such, features a dark, spooky environment. Pumpkins and jack-o'-lanterns appear as obstacles, the latter capable of giving 3000 points if destroyed, and the Pigs wear small pumpkin hats and sometimes are hidden inside a pumpkin. One Large Pig on Trick or Treat 3-15 appears wearing a ghost costume, swinging on a suspended platform.
NIGHT OF THE EGG SNATCHERS
I like dark and stormy nights. They remind me of my cave. But none was as terrifying as the Halloween when the birds found their nest empty. Had the eggs been grabbed by gruesome zombies, fearsome vampires or wicked witches? No, it was just the pigs — although Smooth Cheeks' face is just as freaky as any fright mask if you ask me!
This is the first episode based on Halloween, the second one being Ham'o'ween and the third one being Haunted Hogs.
This is the only seasonal episode to have opening, middle and ending Cutscenes. This is probably because this was the only planned episode at first.
On mid-2012, the update that included Piglantis, it was then removed and replaced by an ending photo, like all of the episodes in the game.