[Fieldrunners 2] : Bizarre Bazaar Heroic perfect + $447 left!! (No items, No Sell)
Well you can perfect this with plenty of $ left by buying Ice towers. It's cheap and effective. So after this you can clear all levels with ease. Just use it to combo with Spark towers , Radiation towers and Pyro towers.
In this game I use only ice towers as a purchased tower. The rest are basic towers.