True. But some are hard to 3* in one go.
Plus, I think I found a couple that are impossible to do in one shot, due to the need to get 2 boxes, which require a different method. [The one with 1 pig and 2 TNT boxes, for example.]
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There are some useful walk-through videos on Bad Pigsty.
http://i.imgur.com/X3Iv9.png
A Star Wars themed Angry Birds game is out soon.
http://www.youtube.com/watch?v=lyB6G4Cz9fI&hd=1
http://i.imgur.com/B3G5M.jpg
I have wasted a few hours playing this on my Nexus 7