I will put my hand up and admit it now: I have not played L4D on Expert difficulty yet. I get most of my playtime at work with my friends in the office. We represent a range of different skill levels, and nowadays we usually find ourselves playing campaigns on advanced. However, there is always the lure of those two achievements: ‘Zombicidal Maniac’ and ‘What Are You Trying To Prove’. When we eventually decide to make the final step up to Expert difficulty (I’m told it deserves the capital ‘E’) I will definatly go back and read this article on tactics for surviving the campaigns. Unlike a lot of the general guides out there, this one has in-depth info specifically taylored to Expert play. Even if Expert seems beyond you right now, I’d definately recommend giving it a read. It’ll give you something to aspire to. It did for me.