Mighty Eagle

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Get 100% Eagle score in every single level

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In order to unlock the Mighty Eagle in the first place, you need to fail a level 3 times in a row. Doesn't matter what one. Once you have done that, you can start using it. I would suggest launching all of your birds except the last one first to destroy as much as you can with them. Then quickly fire your Mighty Eagle after to destroy everything else. The only way to get 100% Eagle score on a level is to destroy everything on the map. Pigs... blocks... everything.