addictive game
http://www.thegamehomepage.com/play/scriball/nearly-impossible/aaqpbbcbdbebfbgbhbibjbkblbmbnbobpbddedfdgdhdidjdkdldmdndffgfhfifjfkflfhhjhhijifkgkhkikjkkklkdmemfmgmhmimjmkmlmmmnmbocodoeofogohoiojokolomonooopo~1bdpdbepebfdfnfpfbgdgngpgbhdhfhihlhnhphbidifiiilinipibjdjnjpjbkdknkpkblplbmpm~2bacadaeafagahaiajakalamanaoapaqaabqbacbcccdcecfcgchcicjckclcmcncocpcqcadcdodqdaecedeeefegeheiejekelemeneoeqeafcfefmfofqfagcgegfggghgigjgkglgmgogqgahchehghkhmhohqhaicieigikimioiqiajcjejfjgjhjijjjkjljmjojqjakckekmkokqkalcldlelflglhliljlklllmlnlolqlamcmomqmanbncndnenfngnhninjnknlnmnnnonpnqnaoqoapbpcpdpepfpgphpipjpkplpmpnpoppp/
Level 4 is do able with tanks and bazookas only if you didnt get a helicompter upgrade
Go with 10 tanks and send them infront of the truck
btw once u get 6 u can start the move because 6 is instant kill for those towers
as soon as the 10 tanks are done
go with pure bazookas preperably lv 2+
u cant finish with no enemies with this tactic but will get you through
good luck