The last few battles are nearly impossible to win by killing al the waves so what i do is kill all the enemies in a wave except i leave 1 archer the wolf 1
then i get a mechanic to fix the wall and the mechanic fixes faster than the archer attaks
then wait and u will win
 "The Great Siege"){kind=icon}
 "Take Something Literally"){kind=icon}
 "3D Logic"){kind=icon}
 "Achievement Unlocked"){kind=icon}
 "IndestructoTank! AE"){kind=icon}
 "Johnny Rocketfingers 2"){kind=icon}
 "Mr. Bounce"){kind=icon}