For two the trick is just to damage the flak tank in the top so it does less damage to the barricade and not destroy it and to pick off the rest of tanks/damaging them so they do as much damage. also just stay in the middle. BUT 4 and 6 are hard! Its tricky positioning your mortar and rocket truck to kill that stupid tank. In 6 i usually can get it down to just the enemies battleships then i die lol.
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