l4d2 it has more zombies and its more funner.
l4d
No they are both the same.
yes
Yes, Download steam, make an account, search L4D2 and download the demo from there.
I have l4d, Not l4d2. But, there is no specific order. They're all different stories with the same people involved.
!buy
yes
yes in verus
you can't
buy it
yes