my friends and i have been recently trying to beat the no mercy campaign on expert mode in left 4 dead for the 360. we have no problem making it to the final stage but we cant seem to make it to the helicopter with all 4 of us still alive. our bigggest issue is the tank, if he doesnt kill all of us he at least gets 1 of us and we arent leaving anyone behind. ive tried alot of the tricks that were used to get through the level but it seems valve has fixed the ones i know about. so pretty much im asking for advice on how to win and any tricks/glitches that still work. thanks