once downloaded, you should just be able to play it in the co-op menu
Undead nightmare pack
It's a free pack so there is no use for a code.
No.
Well, its free isn't it?
For the DLC pack, yes. If you buy it at the store or with a disk, then no. It's a stand alone game.
there are no codes, you must complete the gun challenges
yes but there is absolutely no point
Yes. To get the the four horses of the apocalypse you have to have the undead dlc.
This DLC is out for all consoles (12th May 2013)
Undead Nightmare was released as an expansion pack availiable in the respectives "stores" for consoles. For example, on the PLaysation Store.
You have to purchase a DLC pack from the marketplace. its free so don't worry
... Are you new to games? For PS3 you go to playstation network and download it with money.