Sky of Destruction

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Unlock all aircraft

Win the first mission

Defeat the first enemy carrier

Win all missions on the entire map

Build torpedoes

Build Emi torpedoes

Defeat 20 enemy carriers

Collect 10,000 resources

Destroy the enemy fleet in a mission

Install all armor on an aircraft carrier

Destroy 20 enemy buildings

Upgrade your aircraft carrier to the maximum

Destroy 500 enemy aircraft

Destroy an enemy aircraft by ramming it