Thanks for the help!!
So once your barriers go down, you get rid of the ones that aren’t mattering so much toward the beginning of the paths?
Right now I’m getting rid of the $20 machine gun altogether and letting the barrier guns take out the early mobs until I get the money to build the light beams, and then I place them at the end of the longest path (so that they hit the most guys).
When you say the beams on the 3×3, do you mean the light beams or the laser towers?
I’m also trying to use the tower that goes after flying enemies, which is expensive but working well. I just have a hard time killing off critters fast enough when three queens are all dying at the same time and they just tear through the gate. 