dayglo1988 there's a much easier way to do it :) I didn't figure it out until I watched the walkthrough, but it makes the whole level ten times easier. until then I was using your method and it was HARD.
Yeah the challenges can get extremely irritating, especially when you constantly ALMOST get it but you just can't get the PERFECT setting. over and over and over and over and over and over and over and over and over and over and over and over again. And of the course the walkthrough is no help at all.
Could be good, but needs LOTS of work. The tanks need a "return to base" button, so I dont have to wait for them to get seriously injured before they return. Also, it is very hard to control tanks while they are at the base (say, if I wanted to pause them so they would stay and get more healed) because the build menu pops up and gets in the way.