Level 38:
Use teleporter to move heatbox to fire cannons. This will take long enough that the battery will be charged. This part is easy and you will do it *a lot*
Ball will be pushed away from path by the dozer, remember to turn the dozer around afterwards. Use battery to power laser. Push the two drills against eachother by pushing the left one rightwards.
This level was a pain.
I don't find it too hard. Rather the opposite. I am using basic towers, and have finished the first two maps without thinking too much about strategy. Agree that the tower ranges seems to be off.
for those having trouble with the runner level. Which in my oppinion is by far the hardest level in the game. Build fast tanks with flamethrowers, since your opp will kill with one shot don't worry about hp. I built tanks with level 3 wheels and flamethrowers and usually this killed the skull tanks without them being able to get a shot off.