after fully upgraded u launch urself and put ur rocket either left and rightand u will keep bouncing of platforms n u get lots of money
*warning* dont expect the flight 2 end any time soon though
i conquered the game agez ago
my tip is:
wen u get about 3000 resource build a battery on the spot right next 2 the edge of da screen. then sell the 1 u already have and replace it with a machine gun battery, then make sure use nothing but artliiery batteries after that,
later levels r harder 2 use big groups of units bcause of bombers
hope it helped
use a constant stream of hobbits and driads and u can complete level 16 without even using your arrows against the fat toad, i did it with lv 3 arrow and lv2 base!!!
conquered game easily cos i used cannons, fortress, all aircraft(exept bomber unless large group in 1 spot)
and battleship. u will be suprised wot 20 torpedo bombers can do!!!