Rovio has released Angry Birds Seasons, and it's now available on the App Store. The app is a free upgrade for those that purchased Angry Birds Halloween, or it's available to download for £0.59. If you didn't purchase Angry Birds Halloween, you'll be pleased to know that the 45-level Halloween special edition is included as a free special episode called Trick or Treat -- hence the new title, Angry Birds Seasons. We can only assume that there will be further seasonal episodes to come.
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