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In each campaign mission you have 20 hearts, you will get three stars even if you finish the mission with 18 hearts. In the heroic and iron challenges you only have 1 heart and if you complete the mission you get 1 star each. Hope this answers your question.(Psst! in the top of the menu screen you have the follow on facebook and twitter, awarding one star each)

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11y ago

What else can I help you with?