woot i beat level 2
SWEET, after 3 tries or so i was finally able to beat level 2. its actually not that hard, i even did so without buying the factory to upgrade my turrets. its not as hard as the rest of you are saying you just need to know where to build your turrets. my only complaint for level 2 is that i didn't understand which were higher elavation for the rocks. also level 2 ended while a few big tanks were still left. they would have died, but thats besides the point. i like level 3 the most i'd have to say, but my only problem was the factory. 1000 mins and 100 power to build, then (if i remember correctly) 300 mins and X Power to let upgrade turrets, then you had to upgrade each turret by itslef. now i don't know if that saved me or not, because i just worried about 1 turret on the top and 1 on the bottom to upgrade (ones that were protected by 'dumbies') and i think i had both of them to 15 before the map ended. level 4 was fun, though I'm not sure very difficult, as long as you fought 1vs1 the entire time, there's not much of a chance for you to lose, though the missles i really did enjoy. All i can say is great game.
if you really want to know how to beat level 2 keep reading.
the little depression/elevation that can hold four turrets, thats where i started, right off the bat i build an extra powerplant and built 3 turrets in the area (as close to the road as possible, right next to the rock wall). and those 3 turrets can kill the first unit thus letting you build the fourth turret down/up there. after that i kept building turrets to the left right next to the road, building a new powerplant when ever i had the money. thats where my first 11 turrets were. the last four i put in a 2 by 2 block on the right side of where my inital turrets were. just as a side note i ended up with 5 power plants (I think) but i had over 100 power when the map ended so i doubt that you need that much. i was going for the factory but its not nessary/takes way to many minerals. 3-4 should do fine. just make sure that you keep rebuilding the turrets where they were and it should be easy. when you get to the big tanks your almost done. by then i had over 100 power but only 500 mins, its a losing battle with your money, but as long as you have a little saved up you can kill them all.