Sign in both controllers in the left 4 dead menu then go to vs when there press play with friends then pick who person (there needs to be one infected and one human) after that pick your level then press start enjoy:)
No, you can only play as infected in multiplayer.
no
You can't, the survivors you play as are immune to the disease the infected carry. So it is impossible.
To play as a zombie, you must play on the infected team on Versus mode.
1st of all it's left 4!!!!! Dead and you have to play versus mode in the first. in l4d2, it is versus and scavenge.
LOL jus use a cheat code
if u have live play vs otherwise there isn't a way other than modding to play as infected
I believe playing as an Infected is only available in Versus Mode
You can't become a zombie, but you can play on versus and become a special infected.
You can play it on splitscreen or with XboxLive
You can play Special ops splitscreen you can also play splitscreen in multiplayer
To be an "infected" (aka Zombie) in Left 4 Dead 2 you must play a game mode called "Versus" where you and other human players battle against each other while taking turns being "Survivors" and the "Infected".