not much to it? try playing it on expert jon. the zombies run in zig zag lines, the ai mixes stuff up real good on expert.
plu syou accidently shoot a team mate they are pretty much dead. normal is too easy now for me, advanced is like normal used to be. but expert is where the real fun comes into play.

i can't get enough of it. i will be on tonight playing. probably around 10pm est iluvjae.