Even normal mode is awfully hard. The farthest I can get without buying boosters is round 25. And the soldiers and turrets are too weak. And the only way to make them stronger is with cash, but you dont have enough to make an efficient team. This game is way too hard and needs an update, like moving soldiers or letting us upload our sas zombies 3 character but he should have lots of health and good damage.
FordMustangsRule about SAS: Zombie Assault TD