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Wondering the same myself. I have only completed 2 of the 4 missions so I am not sure yet. But it seems like with each finished mission the x2...
I was hoping someone could help me with keeping my iPad and iPhone sync'd for this game. My ipad cannot keep up with the iPhone. I would try...
Does anyone know how far we can upgrade the weapons / health, etc? I had them all upgraded and then a few weeks later the wing cannons became an...