Most effective path (tower defense maps)

Question

I'm playing a SC2 "tower-defense"-like map, and need to find out how to build walls efficiently, so that units stay longer on the map and take more damage.

The map looks like this:

The most common strategy is to build your wall around a turning point (the red arrow). This seems to give you the ability to deal a lot of damage and a decent time advantage.

But how can I increase that time, by building two spirals, around two turning points, and make it so the unit has to pass one of them 2 times in order to get to the end?

I know it's possible, I've seen it in another map, but can't remember how. :(

Answer

The best solution i have found for games like this where you can manipulate the path is to build a wall that divides every other turn point on each side, block the wall in 1 side and build strong towers in the open end.

The green line is cheap towers for walling and the blue line are your expensive damage and utility towers for doing the actual damage, this forces the creepers to pass your expensive high damage towers for every turn point. remember to focus the high damage towers right at the path if the game has flying units you want all your towers to be able to reach them. if the game has some anti air towers and you need to build some of them you can have them as part of the green wall where the path crosses it self.

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