5.1 – 3 types of turrets

This one is pretty easy. I just set my defenses up covering the rear. And honestly the bottom 2 cannons and machine guns could have been put elsewhere. So few enemies made it to them.

6.1 – 4 types of turrets with no abilities

This one is a lot more simple than it seems.

I picked Machine Guns, Cannons, Flame throwers, and gas grenades.

Set up your gas grenades to cover the approaches and then simply set the rest of your turrets up in such a way that an enemy from any entry point, crosses through 2 sets.

In the image, I’ve set my machine guns and cannons up in such a way that they will shoot enemies coming in from at least 2 spots.

6.2 – A perfect clear

This was by far the hardest one and took me a few tries.
Set up your defenses forward. I have mine towards the middle facing forward. Mortars hitting where the blobs will be. I always had a trickle of enemies making it through and was not able to clear them in time.

The trick is to cover the rear final blocks with your tesla towers. The few enemies that make it through are easy for these to kill. The only thing to watch out for is sometimes they back walk into a spot where the tower won’t be able to hit them. In that case, just missile them down.

You’ll notice in the screenshot, I have 3 enemies left and have not used any abilities other than the default missile.