Under rating threshold (hideshow)
macrobe,if you are having trouble whith the neurotoxin try to lock some people in a room and then use neurotoxin,also use the P.A. to panic people,they die WAY faster.
Under rating threshold (hideshow)
Finally got the 20 kills achievement. Had to farm for a while. The enemies stop spawning from the green doors when you hack the last computer. Probably easier to farm earlier in the game before the specials show up.