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Hey bonbon1015, what I've heard is that levels are generally released first for King.com and Facebook. These levels need then to be adjusted to the different mobile platforms such as iOS, Android, Kindle, Windows Phone, etc. Once this has been done, they need to get approval from the different stores like iTunes, Google Play, etc. All of this can be a bit time consuming and is why you can play it first on king.com and/or Facebook.