What you do is go around as a survivor and survive for 15 mins, while thing thing tries to infect you. If you get infect you try to go kill survivors. The Terrain is well-done and it's involved in strategy like camping on top of higher structures(worked for me).

http://rots19.tripod.com the official site of the maker of this site. (C) ROTS19 (Azeroth Realm). Any resemblance to GameSpot is entirely coincidental. Except for the spot... the ideas for ratings, and the fact that i review things...ok fine, i was influenced by GameSpot. happy now?