The base of the game is awesome, good animations, new concepts ect. But the game is plagued by programming errors and wierd physics. Plus, the level designs for the boss pig levels are purposely built so you can't clear the stage with one bird (stupid balloon buildings). It would really help if you could select the bird you want to launch from your card pile because when you start a stage, the first 3 cards are RANDOM, and so are the buildings spawned. So yeah, RNG in an angry birds game, awful.