Re: L4D SP friendly challenge
yeah they're a biatch to deal with, probably know em already but some hints if want em:
#1 Learn to use the "cover me" and "wait" commands well with the AI
#2 Draw the tanks away from the AI's, if two AI's die your dead, make the tank chase you
#3 watch the smoker very very carefully, stay in a tight group and don't let him pull 1 AI out, once seperated it becomes much much harder...