Complete the whole game
Go through the fourth era
Go through the third era
Pass the second era
Halfway through the game
Buy the best aircraft
Destroy 200 aircrafts
Destroy 200 cannons
Destroy 200 buildings
Destroy 500 tanks
Accumulate 5000 finances
Pass the first era
Complete the fourth mission
Upgrade the aircraft to maximum
Buy a new aircraft
Blow up the building
Drop the superheavy bomb
Complete the first mission
Start the level anew 5 times
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