No
you can only use them in co-op campaign online. you go into settings and at the bottom is death cards. select which one to use and you're done:D
you cant. your serously missin out as well if you not got cod online.
finding Death Cards unlocks certain "Perks" in online gameplay. Similar to the Halo 3 skulls (If you know what I'm talking about.)
If your talking COD 5 then you can collect them by simply playing the missions (co-op or solo) and then you can use them in private co-op matches when you host a game. It sucks that you can't use them in multiplayer co-op =[
Death cards can only be used on multiplayer CO-OP not nazi zombies or single player.
No only in Co-op
you can't
yes
it is in it but you'll need a 4 death streak not like cod 4 that you can use it as a perk
No, only in co-op campiagn.
Private online matches...
I don't know why but maybe you cant