Im a bit confused, owning l4d2 im thinking of buying 1 too, but what exactly is the difference ? Im told in l4d2 r all maps u can find in 1 aswell, is that true ? I have no idea, in case all contents from the first part r in the second too, it would be a waste of money. BUT in case 1 has stuff / maps whatever u cant find in 2 i would go for it. So whats the big deal behind ?