When the light starts to flash wait a few secs (3 or so) and start cooking a grenade, should take them at least to half health and you can finish them when they are down. Enough time to start lining up for the second following wave.
3 star tower defence solo
Shadowcat
(Shadowcat)
#22
I found this to be the easiest of the 3 battle challenges. I didnt even use an engi spec’d character for it. Set up a mine in front of the CP, and use the spawn point behind you as cover. If bots spawn there, run in and mow them down before they have a chance to react.
Make sure to replenish ammo and replace your mine in-between rounds.
Figure out where the lights are right at the start. The bots seem to come out of the halls one door at a time, with enough time to take all three out and prepare for the next door if you are quick.
I just used Gerund with extended mag, fore grip, and muzzle break for the time i tried it; and a Kross as backup with similar attachments. Ended up placing top 100 (for about a day).