a good way to earn easy money is to put the difficulty setting on insane when there are no enemy troops and hit the castle which gives 16 gold when per hit .when an army wave apoaches then you put again the med or easy diffculty button and you have yourself an easy way of earning money
HEY , you complain about you lose a lot of credits when you hit the cars and it isn't worth crashing them , but
what are the oil slicks for and the mines , the auto gun or the missiles.