You don't, all campaigns are playable when you start Left 4 Dead 2.
It is a Key that will unlock the Left 4 Dead 2 in your steam library
Black. Guy
What u have to do is go to left 4 dead 2 and search for sacrifice and the passing and you have to buy the missions and if u don't want to then you have to get an account and play it online
You can purchase The Sacrifice DLC for Left 4 Dead 2, which has you play as characters from the first game. Additionally, you can put character skins of the original characters onto the characters of Left 4 Dead 2 (Only in the PC version)
it is in an update so update your version on xbox live to play it
it will be unlock and then unlock march
he will sacrifice and this coming 2011 they will make a movie but there is no bill because he is dead
The Sacrifice for left 4 dead 1 & 2 come out on October 5, 2010 so hurry up mofos!
Left 4 Dead 2!!
No
left 4 dead 2 can be downloaded from Steam
Yes there is split screen for left 4 dead 2.