to win.
when u start the game, only use the turret egg shooter or watever and u will only sometimes have to train units, when u have enough money, buy another turret spot and build another egg shooter, i dont recommend evolving until 45k xp. when u have enough money buy another spot and build egg shooter and do it again until u have all 4 egg turrets. then evolve once i have 45000xp and walaahhhh, buy all rockets, and the evolve. bye this time, u will never have to send units out. once evolved to final stage, keep the rockets and wait till u have $500k saved, then send 2 super soldiers and u win :) trust me, focuz on turrets overall and u will win. 2 turret in each class is usually the best.
 "Age of War"){kind=icon}
 "Bloons Tower Defense 3"){kind=icon}
 "Bloons Tower Defense"){kind=icon}
 "Brute Wars"){kind=icon}
 "Chaotic - Perim Protector"){kind=icon}