Hi I'm having trouble finishing the last mission of each branch (last campaign mission, last random mission,extra mission,etc), they are a bit too hard for me.
I can get some hives down, stop some of the insects that generate a new base but not all, and eventually as I try to push for conquering a new base something sneaks by and I start losing bases, either by a new hive forming or by cloned marines attacking a base that was otherwise holding the regular aliens perfectly.
What are some good tips for the final missions?