Oh... If only I had known earlier that wood is really just dirty food and metal is really just wet rocks. (I knew there had to be a trick behind the shine)
I don't know if someone else has already pointed this out, but in the description of the death ray upgrade... "Effectivity" isn't a word. The word is efficacy.
Ok, we have 3000 ft. to go to the helicopter. We could:
a) Casually jog the distance in 10 minutes while avoiding the slow moving zombies.
OR!
b) We could spend 2 weeks building monstrous vehicles in order to crush said zombies!
I'll have to look out for it ( Never heard of it before ).