Depends on what you want, check the discriptions, ratings, and comments.
You can't get The Passing on Left 4 Dead 1. It is only a DLC for Left 4 Dead 2.
Yes, in the co-op or single player campagin.
If your talking about L4D2 then all the content created by Valve is free.
No
No they do not come in stores theirs a reason why they call it a dlc its for downloadable content you can get it on live on any game system
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)
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
Yes it does.
You have the restart the game inorder for the DLC to work.
Well i guess it depends on what you're into but in my opinion, Left 4 Dead 2 is way better! It's totally up to you though, but I recommend Left 4 dead 2.
Well...ummm Black ops is way better then left 4 dead 2. Black ops got zombies and multiplayer mode and WAY better graphics! annd left 4 dead 2 gets borring!
Call of duty - Black ops