if you have the passing , their is a mutation called last man on earth
No
there is no fast zombie in left 4 dead...there is however a fast special infected. The hunter is without a dout the fastest special infected in left 4 dead.
you can't without a mod
no
You cant without system link
Unless you buy it straight to your desktop, no.
Yes. Use you're keyboard.
No. Impossible without modifications.
The survivors are rescued in the finale in "The Parish"
use the left analog stick to try to stay on the middle of the horse...
You're kind of asking two separate questions. You can start a game lobby by choosing that option in "Play Online." You could also design a full level yourself by downloading the Left 4 Dead SDK (Source Developer's Kit) and designing a campaign yourself.
left for dead