for level 4 build as many (around 20) tanks you can to take out the towers. after towers are gone move tanks to top of map then spawn lots of rocketmen and send them all up. Lots of rocketmen. i didnt even see the copters when i played
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i found a "cheat". right before someone is about to hit your wall click the build army button and they reset. so shoot your catapult then hit the button then cancel and the boulder will hit before they attack.
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